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  #21  
Old 19-01-2018, 08:51 AM
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Terry B
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Quote:
Originally Posted by skysurfer View Post
Midday at 2:30 ? Weird timezone. Probably North Korea.
In Australia it is midday at 01:00 London time in summer and 03:00 in winter when London has DST.
Whoops. Yes Iím wrong. I was thinking of JD and they start at UT 12.
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  #22  
Old 19-01-2018, 04:03 PM
Rob_K
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I've got tons of data to process but here's first-cab-off-the-rank, low-resolution optical spectrum of Nova Muscae 2018, 16 Jan 2018 (last Tuesday night).

Cheers -
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  #23  
Old 19-01-2018, 05:04 PM
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Merlin66 (Ken)
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Rob,
Your results confirm once again the excellent capabilities of using a SA100 objective grating with a standard lens DSLR combo.
Keep them coming....
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  #24  
Old 19-01-2018, 06:13 PM
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silv (Annette)
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Thank you both, Terry and Skysurfer.

Took me quite a while to get it... 2 hours actually!

@Terry: "Yes I’m wrong. I was thinking of JD and they start at UT 12."

I had skipped that bit because I didn't know what "JD" stands for and hoped / assumed Terry and Skysurfer were merely talking about a mix up in time zones which didn't really have an effect on Terry's previous explanation.
But it did matter verrry much.
I learned it the hard way and therefore will never forget it.

Julian Day starts at noon - which keeps all the discoveries made during a nightly observing session within the same date.

Whereas the commonly known UT(C) begins at midnight and equals London time - without the political daylight saving in summer. The format can be written in decimal fractions of 24 hours where the date is then prepended followed by a dot.

So Rob took the spectrum at UTC 14:29 pm on January 14th 2018.
30 minutes after midnight on his local Australian January 15 AEST.
Or: UT 2018 January 14.6035 .

Got it. Thank you. Sorry for interrupting the thread with these trivia. Maybe somebody else reading here had the same question and confusion and my question has helped them, too.
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  #25  
Old 20-01-2018, 12:19 AM
Rob_K
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Quote:
Originally Posted by silv View Post
So Rob took the spectrum at UTC 14:29 pm on January 14th 2018.
30 minutes after midnight on his local Australian January 15 AEST.
Or: UT 2018 January 14.6035 .
Er, nearly Silv! With daylight saving we're UT+11. Therefore I took the shot at 14:29 + 11 hrs = 25:29 or about 1:30am local time on 15 Jan.

Cheers -
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  #26  
Old 20-01-2018, 05:03 AM
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Quote:
Originally Posted by silv View Post
""
@Terry: "Yes Iím wrong. I was thinking of JD and they start at UT 12."

You mean UTC Oh. 12 is the American way to determine both midnight and noon.
Unless the JD is New Zealand time zone based.
Btw, what a stupid invention those timezones, but that is a different topic.
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  #27  
Old 20-01-2018, 05:20 AM
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deniseselmo (Denise)
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Fantastic! Congratulations!!
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  #28  
Old 24-01-2018, 09:40 PM
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Quote:
Originally Posted by skysurfer View Post
You mean UTC Oh. 12 is the American way to determine both midnight and noon.
Unless the JD is New Zealand time zone based.
Btw, what a stupid invention those timezones, but that is a different topic.
No. Lifted from wikipedia.
The Julian Day Number (JDN) is the integer assigned to a whole solar day in the Julian day count starting from noon Universal time, with Julian day number 0 assigned to the day starting at noon on Monday, January 1, 4713 BC, proleptic Julian calendar (November 24, 4714 BC, in the proleptic Gregorian calendar),[1][2][3] a date at which three multi-year cycles started (which are: Indiction, Solar, and Lunar cycles) and which preceded any dates in recorded history.[4] For example, the Julian day number for the day starting at 12:00 UT on January 1, 2000, was 2,451,545.
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