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LST Time ?

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#1 zxx

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Posted 25 January 2021 - 03:28 PM

What does LST time mean on my Celestron CGEM DX ?

 

Thanks



#2 jpflood

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Posted 25 January 2021 - 03:39 PM

Don't have one, but I'm guessing Local Sidereal Time.


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#3 Dynan

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Posted 25 January 2021 - 03:39 PM

Local Sidereal Time



#4 StarBurger

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Posted 25 January 2021 - 03:42 PM

LST = Local Sidereal Time. This is the RA (Right Ascension) value on the sky crossing your local N-S meridian at the time.

Useful if you are using RA/DEC setting circles only but these days with goto LST is of little practical use.



#5 zxx

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Posted 25 January 2021 - 03:44 PM

LST = Local Sidereal Time. This is the RA (Right Ascension) value on the sky crossing your local N-S meridian at the time.

Useful if you are using RA/DEC setting circles only but these days with goto LST is of little practical use.

Thanks, so will not effect goto ?



#6 StarBurger

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Posted 25 January 2021 - 03:50 PM

No, will not effect goto. All a scope needs to know is your local time and longitude. LST is just a derivation of that.


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#7 OzAndrewJ

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Posted 25 January 2021 - 04:17 PM

Gday Starburger

No, will not effect goto. All a scope needs to know is your local time and longitude.

Just a word of caution with Meades.

They run 2 or more clocks internally, one for local time and one for sidereal time

and these can get desynchronised through improper "adjusting" of time after aligning.

One of the classic tests with a Meade is to read the local date/time/longitude/TZ/DST

then compare the "reported" LST to a web based app to see if they match.

 

ie in Theory, all the data should be synchronised, but it doesnt always work that way.grin.gif

 

Andrew Johansen Melbourne Australia


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