Astronomy Site: Meade Advanced Products Users Group Archive: Re: [M]: Re: Local/GMT TIme Offset


 

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Subject: Re: [M]: Re: Local/GMT TIme Offset
From: Jan Barker
Reply To: mapug@shore.net
Date: Tue May 22 23:29:30 2001

While you're here, how about checking out the Astronomy Book List ?

You can leave it as 00 all the year, as long as long as you recognise that your LX200 is one hour behind the local (BST) time. It really is much simpler to ignore daylight saving altogether. Your scope and attached computer (if it is part of your
setup) are then automatically at UT.
Cheers
Jan


> Hi Ralph,
>
> In the UK with BST, is the time offset +1
> as the clocks go forwrd an hour and then return to 00 offset when the clocks go back again in the winter?
> Or as I am only a fraction of a degree from Greenwich does the offset stay at 00
> all year round?
>
> Clear Skies,
>
> Andy.
>
> 51.18N 000.01E
>
>
> ------------------------------------------------------------------------
>
> Subject: Re: [M]: Re: Local/GMT TIme Offset
> Date: Mon, 21 May 2001 09:57:27 -0400
>
> At the risk of more flames on this topic:
>
> CDST is GMT - 5
>
> GMT is CDST + 5
>
> The two statements are the same. The sign difference is due to converting from GMT to local time or from local time to GMT. If you know GMT then you subtract 5 to get to local time. This is why you see CDST as -5 on sites that are GMT based.
>
> However, on the LX200 you enter the local time. The LX200 wants to know the GMT. In this case you are converting from local time to GMT. In this case GMT is CDST plus 5.
>
> So the rule for the entering of the 'Hours from GMT' on the LX200 is: What number do I add to the time that I have entered into the LX200 to get the equivalent GMT time? (Sorry for those that have something other than a whole hour difference!).
>
> Ralph Pass
>
> RebelPPC wrote:
>
> > messier27 Wrote:
> > > We have been using an LX200 for about four years now and I thought
> > > I understood this.
> > > Central Daylight Savings Time is "+5" hours.
> >
> > Only according to Meade's way of thinking is CDST +5. I also went through
> > all this when I first got my scope. I set its offset time to what is the
> > "standard" offset and nothing worked. Reading the manual plus many messages
> > from Mapug members showed me that Meade doesn't use the universal or
> > standard offset but uses their own made-up offset. For example.... the
> > standard or universal offset for where I live (Eastern Daylight Savings)
> > is -4 but Meade's made up offset for my area is +4. The standard universal
> > offset for you (Central Daylight Savings) is -5 but Meade's made up offset
> > is +5..... totally opposite from the universal standard.
> >
> > With this it might make you wonder of the screws and bolts on your Meade
> > scope might turn counter-clockwise to tighten and clockwise to loosen.
> > Anyway, for a chart of the "Meade" standard, goto page 11 of your manual and
> > for the real universal standard goto greenwichmeantime.com.
> >
> > Regards
> > FLag
> > 8" f/10 LX-200 #845198
> > 36:10:32.754 N
> > 82:43:31.098 W
> > +4 Meade Offset/-4 GMT Universal Standard Offset


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