VintageBigBlue.org

 

RE: [Losmandy_users] Polar alignment -- more than once


Jul 1, 2008

 


----------------------------

#38108 Jul 1, 2008

I've been working with my new G11 w/Gemini. I got the Losmandy Polar

Alignment finder and begin the night with everything sync'd. I use

three stars for alignment before I venture off. After a couple of

hours Polaris is off by a considerable amount. I re-align & lock the

alt & azm screws after alignment. This has happened more than

once so whatever I'm NOT doing, I'm not doing it consistently!



I want to start some astrophotography but this 're-polar alignment' two

or three times a night doesn't seem right.



Should polar alignment be needed periodically through a 3-4 hour

viewing session?



Thanks for any any help you can offer,



.......a newbie....



Kim



----------------------------

#38110 Jul 1, 2008

kim.morgan86 wrote: > I've been working with my new G11 w/Gemini. I got the Losmandy Polar

> Alignment finder and begin the night with everything sync'd. I use

> three stars for alignment before I venture off. After a couple of

> hours Polaris is off by a considerable amount. I re-align & lock the

> alt & azm screws after alignment.



Do you mean Polaris is "off" in the polar scope? If so, this means your

mount/tripod is moving during the night. Is it possible that a tripod

leg is sinking into the ground?



The polar alignment scope looks through the RA axis so you can adjust

the azimuth and altitude of the mount so its RA axis is parallel to the

Earth's axis. This is purely a mechanical adjustment, and has nothing to

do with the Gemini pointing model.



If you have to readjust the azimuth and altitude later in the evening,

the only explanation is that the mount has moved somehow.



Mike

-----



Mike Dodd

Montpelier, VA USA

astronomy.mdodd.com



----------------------------

#38112 Jul 1, 2008

If Polaris is moving throughout the night in the polar scope, it should! Polaris is . degree away from the NCP so it will describe a circle around the actual pole. The polar scope is not driven by the motor so if Polaris has moved from where you set it up at the beginning of your observing just rotate the polar scope to put Polaris back into position. It and the other line-up stars should still be aligned. Actually there really is no reason to reset Polaris in your polar scope if you did an adequate alignment at the beginning our your observing.







If, on the other hand, your Gemini is not putting the proper star or object in the FOV then you might consider examining your original polar alignment to see if anything on the mount is moving.







Bryan







---------------



From: Losmandy_users@yahoogroups.com [mailto:Losmandy_users@yahoogroups.com] On Behalf Of Mike Dodd

Sent: Tuesday, July 01, 2008 9:17 AM

To: Losmandy_users@yahoogroups.com

Subject: Re: [Losmandy_users] Polar alignment -- more than once







kim.morgan86 wrote: > I've been working with my new G11 w/Gemini. I got the Losmandy Polar

> Alignment finder and begin the night with everything sync'd. I use

> three stars for alignment before I venture off. After a couple of

> hours Polaris is off by a considerable amount. I re-align & lock the

> alt & azm screws after alignment.



Do you mean Polaris is "off" in the polar scope? If so, this means your

mount/tripod is moving during the night. Is it possible that a tripod

leg is sinking into the ground?



The polar alignment scope looks through the RA axis so you can adjust

the azimuth and altitude of the mount so its RA axis is parallel to the

Earth's axis. This is purely a mechanical adjustment, and has nothing to

do with the Gemini pointing model.



If you have to readjust the azimuth and altitude later in the evening,

the only explanation is that the mount has moved somehow.



Mike

-----



Mike Dodd

Montpelier, VA USA

astronomy.mdodd.com astronomy.mdodd.com>











[Non-text portions of this message have been removed]



----------------------------

#38115 Jul 1, 2008

Once you set your polar axis to point at the 3 stars you should be set. Make sure you're on the correct 3 stars, make sure your bolts are all tight, including the tripod bolts and the Altitude and Azimuth bolts.



Tom P.





From: "kim.morgan86" junk1@...>

Date: 2008/07/01 Tue AM 08:36:33 CDT

To: Losmandy_users@yahoogroups.com

Subject: [Losmandy_users] Polar alignment -- more than once





I've been working with my new G11 w/Gemini. I got the Losmandy Polar

Alignment finder and begin the night with everything sync'd. I use

three stars for alignment before I venture off. After a couple of

hours Polaris is off by a considerable amount. I re-align & lock the

alt & azm screws after alignment. This has happened more than

once so whatever I'm NOT doing, I'm not doing it consistently!



I want to start some astrophotography but this 're-polar alignment' two

or three times a night doesn't seem right.



Should polar alignment be needed periodically through a 3-4 hour

viewing session?



Thanks for any any help you can offer,



.......a newbie....



Kim







----------------------------

#38116 Jul 1, 2008

Bryan,



Thanks for the help. Tonight (if SW Michigan skies don't get me first) I'll

try your suggestion(s) and see if it 're-aligns' just by rotating the Polar

scope. I know my mount does not move, and the legs are boards to ensure

they don't sink. In reading and re-reading the manual (I have V.4) I may

have self inflicted my own wounds. I generally do not Cold Start the Gemini

even though I move the mount in/out of the house between sessions.



I now have a small punch list of items to run through my next time out.

Thank you again.



Kim

On Tue, Jul 1, 2008 at 10:29 AM, SNOW, BRYAN A bsnow@...> wrote:



> If Polaris is moving throughout the night in the polar scope, it should!

> Polaris is . degree away from the NCP so it will describe a circle around

> the actual pole. The polar scope is not driven by the motor so if Polaris

> has moved from where you set it up at the beginning of your observing just

> rotate the polar scope to put Polaris back into position. It and the other

> line-up stars should still be aligned. Actually there really is no reason to

> reset Polaris in your polar scope if you did an adequate alignment at the

> beginning our your observing.

>

> If, on the other hand, your Gemini is not putting the proper star or object

> in the FOV then you might consider examining your original polar alignment

> to see if anything on the mount is moving.

>

> Bryan

>

---------------

>

> From: Losmandy_users@yahoogroups.com Losmandy_users%40yahoogroups.com>[mailto:

> Losmandy_users@yahoogroups.com Losmandy_users%40yahoogroups.com>] On

> Behalf Of Mike Dodd

> Sent: Tuesday, July 01, 2008 9:17 AM

> To: Losmandy_users@yahoogroups.com Losmandy_users%40yahoogroups.com>

> Subject: Re: [Losmandy_users] Polar alignment -- more than once

>

> kim.morgan86 wrote:

> > I've been working with my new G11 w/Gemini. I got the Losmandy Polar

> > Alignment finder and begin the night with everything sync'd. I use

> > three stars for alignment before I venture off. After a couple of

> > hours Polaris is off by a considerable amount. I re-align & lock the

> > alt & azm screws after alignment.

>

> Do you mean Polaris is "off" in the polar scope? If so, this means your

> mount/tripod is moving during the night. Is it possible that a tripod

> leg is sinking into the ground?

>

> The polar alignment scope looks through the RA axis so you can adjust

> the azimuth and altitude of the mount so its RA axis is parallel to the

> Earth's axis. This is purely a mechanical adjustment, and has nothing to

> do with the Gemini pointing model.

>

> If you have to readjust the azimuth and altitude later in the evening,

> the only explanation is that the mount has moved somehow.

>

> Mike

> -----

>

> Mike Dodd

> Montpelier, VA USA

> astronomy.mdodd.com astronomy.mdodd.com>

>

> [Non-text portions of this message have been removed]

>

>

>





[Non-text portions of this message have been removed]



----------------------------

#38118 Jul 1, 2008

Kim,



Set up the scope and align the polar scope as noted earlier. Then with the scope powered off set it with Counterweights down. turn on the mount and cold start. Verify your setup for Mount type, coordinates, and time.



If you have Software Bisque's The Sky, I have put a database with the brightest stars in the Gemini group's file section. It might be in this group's section too. Do the first star with a synchronize and then goto another 4 bright stars and do additional aligns, all on one side of the mount. The go to the other half of the sky and do 2 more aligns at least. That should zero you in pretty well.



Tom P.





From: Kim junk1@...>

Date: 2008/07/01 Tue AM 10:20:09 CDT

To: Losmandy_users@yahoogroups.com

Subject: Re: [Losmandy_users] Polar alignment -- more than once





Bryan,



Thanks for the help. Tonight (if SW Michigan skies don't get me first) I'll

try your suggestion(s) and see if it 're-aligns' just by rotating the Polar

scope. I know my mount does not move, and the legs are boards to ensure

they don't sink. In reading and re-reading the manual (I have V.4) I may

have self inflicted my own wounds. I generally do not Cold Start the Gemini

even though I move the mount in/out of the house between sessions.



I now have a small punch list of items to run through my next time out.

Thank you again.



Kim

On Tue, Jul 1, 2008 at 10:29 AM, SNOW, BRYAN A bsnow@...> wrote:



> If Polaris is moving throughout the night in the polar scope, it should!

> Polaris is . degree away from the NCP so it will describe a circle around

> the actual pole. The polar scope is not driven by the motor so if Polaris

> has moved from where you set it up at the beginning of your observing just

> rotate the polar scope to put Polaris back into position. It and the other

> line-up stars should still be aligned. Actually there really is no reason to

> reset Polaris in your polar scope if you did an adequate alignment at the

> beginning our your observing.

>

> If, on the other hand, your Gemini is not putting the proper star or object

> in the FOV then you might consider examining your original polar alignment

> to see if anything on the mount is moving.

>

> Bryan

>

---------------

>

> From: Losmandy_users@yahoogroups.com Losmandy_users%40yahoogroups.com>[mailto:

> Losmandy_users@yahoogroups.com Losmandy_users%40yahoogroups.com>] On

> Behalf Of Mike Dodd

> Sent: Tuesday, July 01, 2008 9:17 AM

> To: Losmandy_users@yahoogroups.com Losmandy_users%40yahoogroups.com>

> Subject: Re: [Losmandy_users] Polar alignment -- more than once

>

> kim.morgan86 wrote:

> > I've been working with my new G11 w/Gemini. I got the Losmandy Polar

> > Alignment finder and begin the night with everything sync'd. I use

> > three stars for alignment before I venture off. After a couple of

> > hours Polaris is off by a considerable amount. I re-align & lock the

> > alt & azm screws after alignment.

>

> Do you mean Polaris is "off" in the polar scope? If so, this means your

> mount/tripod is moving during the night. Is it possible that a tripod

> leg is sinking into the ground?

>

> The polar alignment scope looks through the RA axis so you can adjust

> the azimuth and altitude of the mount so its RA axis is parallel to the

> Earth's axis. This is purely a mechanical adjustment, and has nothing to

> do with the Gemini pointing model.

>

> If you have to readjust the azimuth and altitude later in the evening,

> the only explanation is that the mount has moved somehow.

>

> Mike

> -----

>

> Mike Dodd

> Montpelier, VA USA

> astronomy.mdodd.com astronomy.mdodd.com>

>

> [Non-text portions of this message have been removed]

>

>

>



[Non-text portions of this message have been removed]







----------------------------

#38120 Jul 1, 2008

I for one find that polaris is not a good alignment star...







Rgds,







Canela







---------------



From: Losmandy_users@yahoogroups.com [mailto:Losmandy_users@yahoogroups.com] On Behalf Of Kim

Sent: ter.a-feira, 1 de Julho de 2008 18:16

To: Losmandy_users@yahoogroups.com

Subject: Re: Re: [Losmandy_users] Polar alignment -- more than once







Thanks Tom. I do have The Sky. Right now (from 42N) I use Vega, Polaris,

Arcturus. I'll try and find something closer to RA 11 or 12 and add that

one in the mix. Those 4 should give me a pretty good spread.



Thanks again,



Kim On Tue, Jul 1, 2008 at 12:22 PM, tpicciani@... mailto:tpicciani%40verizon.net> > wrote:



> Kim,

>

> Set up the scope and align the polar scope as noted earlier. Then with the

> scope powered off set it with Counterweights down. turn on the mount and

> cold start. Verify your setup for Mount type, coordinates, and time.

>

> If you have Software Bisque's The Sky, I have put a database with the

> brightest stars in the Gemini group's file section. It might be in this

> group's section too. Do the first star with a synchronize and then goto

> another 4 bright stars and do additional aligns, all on one side of the

> mount. The go to the other half of the sky and do 2 more aligns at least.

> That should zero you in pretty well.

>

> Tom P.

>

> From: Kim junk1@... mailto:junk1%40dishmail.net> junk1%40dishmail.net>>

> Date: 2008/07/01 Tue AM 10:20:09 CDT

> To: Losmandy_users@yahoogroups.com mailto:Losmandy_users%40yahoogroups.com> Losmandy_users%40yahoogroups.com>

> Subject: Re: [Losmandy_users] Polar alignment -- more than once

>

> Bryan,

>

> Thanks for the help. Tonight (if SW Michigan skies don't get me first) I'll

> try your suggestion(s) and see if it 're-aligns' just by rotating the Polar

> scope. I know my mount does not move, and the legs are boards to ensure

> they don't sink. In reading and re-reading the manual (I have V.4) I may

> have self inflicted my own wounds. I generally do not Cold Start the Gemini

> even though I move the mount in/out of the house between sessions.

>

> I now have a small punch list of items to run through my next time out.

> Thank you again.

>

> Kim

>

> On Tue, Jul 1, 2008 at 10:29 AM, SNOW, BRYAN A bsnow@... mailto:bsnow%40mail.accd.edu> bsnow%40mail.accd.edu>>

> wrote:

>

> > If Polaris is moving throughout the night in the polar scope, it should!

> > Polaris is . degree away from the NCP so it will describe a circle around

> > the actual pole. The polar scope is not driven by the motor so if Polaris

> > has moved from where you set it up at the beginning of your observing

> just

> > rotate the polar scope to put Polaris back into position. It and the

> other

> > line-up stars should still be aligned. Actually there really is no reason

> to

> > reset Polaris in your polar scope if you did an adequate alignment at the

> > beginning our your observing.

> >

> > If, on the other hand, your Gemini is not putting the proper star or

> object

> > in the FOV then you might consider examining your original polar

> alignment

> > to see if anything on the mount is moving.

> >

> > Bryan

> >

---------------

> >

> > From: Losmandy_users@yahoogroups.com mailto:Losmandy_users%40yahoogroups.com> Losmandy_users%40yahoogroups.com>Losmandy_users%

> 40yahoogroups.com>[mailto:

> > Losmandy_users@yahoogroups.com mailto:Losmandy_users%40yahoogroups.com> Losmandy_users%40yahoogroups.com>Losmandy_users%

> 40yahoogroups.com>] On

> > Behalf Of Mike Dodd

> > Sent: Tuesday, July 01, 2008 9:17 AM

> > To: Losmandy_users@yahoogroups.com mailto:Losmandy_users%40yahoogroups.com> Losmandy_users%40yahoogroups.com>Losmandy_users%

> 40yahoogroups.com>

> > Subject: Re: [Losmandy_users] Polar alignment -- more than once

> >

> > kim.morgan86 wrote:

> > > I've been working with my new G11 w/Gemini. I got the Losmandy Polar

> > > Alignment finder and begin the night with everything sync'd. I use

> > > three stars for alignment before I venture off. After a couple of

> > > hours Polaris is off by a considerable amount. I re-align & lock the

> > > alt & azm screws after alignment.

> >

> > Do you mean Polaris is "off" in the polar scope? If so, this means your

> > mount/tripod is moving during the night. Is it possible that a tripod

> > leg is sinking into the ground?

> >

> > The polar alignment scope looks through the RA axis so you can adjust

> > the azimuth and altitude of the mount so its RA axis is parallel to the

> > Earth's axis. This is purely a mechanical adjustment, and has nothing to

> > do with the Gemini pointing model.

> >

> > If you have to readjust the azimuth and altitude later in the evening,

> > the only explanation is that the mount has moved somehow.

> >

> > Mike

> > -----

> >

> > Mike Dodd

> > Montpelier, VA USA

> > astronomy.mdodd.com astronomy.mdodd.com> astronomy.mdodd.com astronomy.mdodd.com> >

> >

> > [Non-text portions of this message have been removed]

> >

> >

> >

>

> [Non-text portions of this message have been removed]

>

>

>

>

>



[Non-text portions of this message have been removed]











[Non-text portions of this message have been removed]







----------------------------

#38121 Jul 1, 2008

If you move the scope between sessions, you must "Cold Start". Warm

start is when you have not touched the scope and have just parked it

the night before.

Set it up, do a polar alignment, then a 3 star alignment and then GO

To a star near the meridian and equator and center it in the ep

crosshair, then go to "Align Scope" and choose "Polar Align Corr" and

let it move the mount where the star should be and use the Dec and AZ

screws to put the star back into the cross hair. This will give you a

very good polar alignment that will hold all night.

A word of caution about setting the legs on boards. Make sure the

boards are able to sit very flatly on the ground and that it is hard

ground. If if is on grass, the grass will compress over time and the

alignment will change.

Floyd --- In Losmandy_users@yahoogroups.com, Kim junk1@...> wrote:

>

> Bryan,

>

> Thanks for the help. Tonight (if SW Michigan skies don't get me

first) I'll

> try your suggestion(s) and see if it 're-aligns' just by rotating

the Polar

> scope. I know my mount does not move, and the legs are boards to ensure

> they don't sink. In reading and re-reading the manual (I have V.4)

I may

> have self inflicted my own wounds. I generally do not Cold Start

the Gemini

> even though I move the mount in/out of the house between sessions.

>

> I now have a small punch list of items to run through my next time out.

> Thank you again.

>

> Kim

>

> On Tue, Jul 1, 2008 at 10:29 AM, SNOW, BRYAN A bsnow@...> wrote:

>

> > If Polaris is moving throughout the night in the polar scope, it

should!

> > Polaris is . degree away from the NCP so it will describe a circle

around

> > the actual pole. The polar scope is not driven by the motor so if

Polaris

> > has moved from where you set it up at the beginning of your

observing just

> > rotate the polar scope to put Polaris back into position. It and

the other

> > line-up stars should still be aligned. Actually there really is no

reason to

> > reset Polaris in your polar scope if you did an adequate alignment

at the

> > beginning our your observing.

> >

> > If, on the other hand, your Gemini is not putting the proper star

or object

> > in the FOV then you might consider examining your original polar

alignment

> > to see if anything on the mount is moving.

> >

> > Bryan

> >

---------------

> >

> > From: Losmandy_users@yahoogroups.com

Losmandy_users%40yahoogroups.com>[mailto:

> > Losmandy_users@yahoogroups.com Losmandy_users%40yahoogroups.com>] On

> > Behalf Of Mike Dodd

> > Sent: Tuesday, July 01, 2008 9:17 AM

> > To: Losmandy_users@yahoogroups.com Losmandy_users%40yahoogroups.com>

> > Subject: Re: [Losmandy_users] Polar alignment -- more than once

> >

> > kim.morgan86 wrote:

> > > I've been working with my new G11 w/Gemini. I got the Losmandy Polar

> > > Alignment finder and begin the night with everything sync'd. I use

> > > three stars for alignment before I venture off. After a couple of

> > > hours Polaris is off by a considerable amount. I re-align & lock the

> > > alt & azm screws after alignment.

> >

> > Do you mean Polaris is "off" in the polar scope? If so, this means

your

> > mount/tripod is moving during the night. Is it possible that a tripod

> > leg is sinking into the ground?

> >

> > The polar alignment scope looks through the RA axis so you can adjust

> > the azimuth and altitude of the mount so its RA axis is parallel

to the

> > Earth's axis. This is purely a mechanical adjustment, and has

nothing to

> > do with the Gemini pointing model.

> >

> > If you have to readjust the azimuth and altitude later in the evening,

> > the only explanation is that the mount has moved somehow.

> >

> > Mike

> > -----

> >

> > Mike Dodd

> > Montpelier, VA USA

> > astronomy.mdodd.com astronomy.mdodd.com>

> >

> > [Non-text portions of this message have been removed]

> >

> >

> >

>

>

> [Non-text portions of this message have been removed]

>



----------------------------

#38134 Jul 1, 2008

Floyd Blue wrote: > If you move the scope between sessions, you must "Cold Start". Warm

> start is when you have not touched the scope and have just parked it

> the night before.



I think you're one level off, Floyd. The Warm Start definitely can

(must) be used if you have loosened the clutches and moved the telescope

after powering-down. The previous pointing model still exists in the

Gemini, so as long as you haven't relocated the tripod to some other

location, all you need to do is put the mount into the CWD position and

do a Warm Start. Then choose a bright star, center it in the eyepiece,

and tell Gemini to synchronize on it. Gemini will then adjust its

pointing model to match the star's location.



Warm REstart is used when, as you said, "you have not touched the scope

and have just parked it the night before."



In reality, there is little difference between the Warm Start and the

Warm Restart. Both assume you're starting from a known position (the

last parked position for Warm Restart, and the CWD position for Warm

Start), and both modes allow you to synchronize the existing pointing

model on a known alignment star. Beyond that, there isn't any difference

between the two startup modes.





Mike

-----



Mike Dodd

Montpelier, VA USA

astronomy.mdodd.com







----------------------------

#38140 Jul 1, 2008

Hello Mike,

I was referring to this statement.



"I may have self inflicted my own wounds. I generally do not Cold

Start the Gemini even though I move the mount in/out of the house

between sessions."



In this case you must use the cold start as the scope has been moved

between sessions.



From the manual it states.



"Cold Start" Clears the current modeling data, and should be used when

ever the mount has be moved from its polar alignment position after a

previous Observing Session.



"Warm start" Preserves the modeling data, but not the current

telescope position data. It should be used if the mount has not been

moved since the last observing session, but the telescope has be moved

on the mount. The mount must be in the Startup Position during a Warm

Start.



"Warm Restart" preserves all modeling and position data, This should

be used if no movement of the mount or telescope has occurred since

the last observing session.



So, if he moves the mount inside and then moves it outside again, the

"Cold Start" must be used, correct?



Floyd --- In Losmandy_users@yahoogroups.com, Mike Dodd mike@...> wrote:

>

> Floyd Blue wrote:

> > If you move the scope between sessions, you must "Cold Start". Warm

> > start is when you have not touched the scope and have just parked it

> > the night before.

>

> I think you're one level off, Floyd. The Warm Start definitely can

> (must) be used if you have loosened the clutches and moved the

telescope

> after powering-down. The previous pointing model still exists in the

> Gemini, so as long as you haven't relocated the tripod to some other

> location, all you need to do is put the mount into the CWD position and

> do a Warm Start. Then choose a bright star, center it in the eyepiece,

> and tell Gemini to synchronize on it. Gemini will then adjust its

> pointing model to match the star's location.

>

> Warm REstart is used when, as you said, "you have not touched the scope

> and have just parked it the night before."

>

> In reality, there is little difference between the Warm Start and the

> Warm Restart. Both assume you're starting from a known position (the

> last parked position for Warm Restart, and the CWD position for Warm

> Start), and both modes allow you to synchronize the existing pointing

> model on a known alignment star. Beyond that, there isn't any

difference

> between the two startup modes.

>

>

> Mike

> -----

>

> Mike Dodd

> Montpelier, VA USA

> astronomy.mdodd.com

>



----------------------------

#38141 Jul 1, 2008

Bryan,



I think you need to rethink your explanation. The polar scope is mounted in the RA shaft. The RA

shaft is driven and tracks the sky. The polar scope will then also track the sky.



Don

----- Original Message -----

From: "SNOW, BRYAN A" bsnow@...>

To: Losmandy_users@yahoogroups.com>

Sent: Tuesday, July 01, 2008 10:29 AM

Subject: RE: [Losmandy_users] Polar alignment -- more than once





If Polaris is moving throughout the night in the polar scope, it should! Polaris is . degree away

from the NCP so it will describe a circle around the actual pole. The polar scope is not driven by

the motor so if Polaris has moved from where you set it up at the beginning of your observing just

rotate the polar scope to put Polaris back into position. It and the other line-up stars should

still be aligned. Actually there really is no reason to reset Polaris in your polar scope if you

did an adequate alignment at the beginning our your observing.







If, on the other hand, your Gemini is not putting the proper star or object in the FOV then you

might consider examining your original polar alignment to see if anything on the mount is moving.







Bryan



----------------------------

#38145 Jul 1, 2008

Floyd Blue wrote: > Hello Mike,

> I was referring to this statement.

>

> "I may have self inflicted my own wounds. I generally do not Cold

> Start the Gemini even though I move the mount in/out of the house

> between sessions."

>

> In this case you must use the cold start as the scope has been moved

> between sessions.



Sorry; you are correct, unless the tripod is set up in exactly the same

spot and orientation as it was previously.



Mike

-----



Mike Dodd

Montpelier, VA USA

astronomy.mdodd.com



----------------------------

#38151 Jul 2, 2008

You re-thought it for me, thanks. You are right, the polar axis will drive the scope around. I stand corrected.



Bryan



-----Original Message-----

From: Losmandy_users@yahoogroups.com [mailto:Losmandy_users@yahoogroups.com] On Behalf Of Don D'Egidio

Sent: Tuesday, July 01, 2008 4:01 PM

To: Losmandy_users@yahoogroups.com

Subject: Re: [Losmandy_users] Polar alignment -- more than once



Bryan,



I think you need to rethink your explanation. The polar scope is mounted in the RA shaft. The RA

shaft is driven and tracks the sky. The polar scope will then also track the sky.



Don

----- Original Message -----

From: "SNOW, BRYAN A" bsnow@...>

To: Losmandy_users@yahoogroups.com>

Sent: Tuesday, July 01, 2008 10:29 AM

Subject: RE: [Losmandy_users] Polar alignment -- more than once





If Polaris is moving throughout the night in the polar scope, it should! Polaris is . degree away

from the NCP so it will describe a circle around the actual pole. The polar scope is not driven by

the motor so if Polaris has moved from where you set it up at the beginning of your observing just

rotate the polar scope to put Polaris back into position. It and the other line-up stars should

still be aligned. Actually there really is no reason to reset Polaris in your polar scope if you

did an adequate alignment at the beginning our your observing.







If, on the other hand, your Gemini is not putting the proper star or object in the FOV then you

might consider examining your original polar alignment to see if anything on the mount is moving.







Bryan









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