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https://docshare.tips/sidereal-time_5749e2aeb6d87fb10a8b482a.html#:~:text=To%20an%20accuracy%20within%200.1%20second%20per%20century%2C,it%20to%20a%20value%20in%20the%20range%200-24.
https://www.astro.umd.edu/~jph/GST_eqn.pdf
Formula for Greenwich Sidereal Time A formula relating the Greenwich mean (not apparent) sidereal time (GST) to the universal time (UT), good during a given year can be found on page B8 of the Astronomical Almanac. It looks like this: GST = G + 0.0657098244 × d + 1.00273791 × t
https://lweb.cfa.harvard.edu/~jzhao/times.html
Greenwich Mean Sidereal Time (GMST) is the hour angle of the average position of the vernal equinox, neglecting short term motions of the equinox due to nutation. In conformance with IAU conventions for the motion of the earth's equator and equinox [ref 7] GMST is linked directly to UT1 through the equation
https://gssc.esa.int/navipedia/index.php/Sidereal_Time
Greenwich "Apparent" Sidereal Time (GAST) ( [math]\Theta_ {_G} [/math] ): is the hour angle of "true" Aries point, from Greenwich meridian. Local Mean Sidereal Time (LMST) ( [math]\theta [/math] ): the same that LAST with the mean equinox.
https://docshare.tips/sidereal-time_5749e2aeb6d87fb10a8b482a.html
To an accuracy within 0.1 second per century, Greenwich (Mean) Sidereal Time (in hours and decimal parts of an hour) can be calculated as GMST = 18.697374558 + 24.06570982441908 * D , where D is the interval, in days including any fraction of a day, since 2000 January 1, at 12h UT (interval counted positive if forwards to a later time than the 2000 reference instant), and the result is freed from any integer …
https://greenwichmeantime.com/
What is Greenwich Mean Time (GMT)? United Kingdom is now on GMT . GMT now . 4:32:51 AM 02/12/2021 GMT +00:00. Quick Find for Local Time place Clocks and Time Tools. Time Zone Converter, view the time difference Convert from a place or time zone. World Clock, time right now in any location Current local time around the world.
https://squarewidget.com/astronomical-calculations-sidereal-time/
That means as A crosses your local meridian then your local sidereal time (LST) is 19:00 hours. And later when B crosses your local meridian you would say it is now 23:00 LST. Before I say anything else about sidereal time I need to say a few words about the celestial sphere.
https://astronomy.stackexchange.com/questions/21002/how-to-find-greenwich-mean-sideral-time
Applying equation (2) yields the Greenwich Mean Sidereal Time at midnight: H 0 = 1665686.527373333 sidereal seconds. Applying equation (4) and multiplying by t = 8 ∗ 3600 seconds yields another 28878.85178960284 sidereal seconds to the above.
http://neoprogrammics.com/sidereal_time_calculator/
Sidereal Time Calculator For Any Date, Time and Longitude: Local Date ±YMD (Neg=BC) Local Time HMS (00 to 24h) Time Zone Difference HM (00 to ±12h) ΔT (Delta T) ±HMS: Local Time = UT: 2459550.5: 0.000000000000 +0.208333333333 +0.000000000000 : Calendar Mode: Julian Gregorian
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