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ASTOR 310 Observational AstronomyFormula 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
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How to fill out approximate sidereal time
How to fill out approximate sidereal time:
01
Determine the date and time for which you want to calculate the sidereal time.
02
Convert the date and time to UTC (Coordinated Universal Time) if necessary.
03
Use the appropriate formula to calculate the Julian Date for the given date and time.
04
Calculate the number of Julian centuries since J2000.0 by subtracting 2451545.0 from the Julian Date and dividing the result by 36525.
Use the following formula to calculate the mean sidereal time in hours:
Mean Sidereal Time = 280.46061837 + 360.98564736629 * (N + 0.000387933 * T^2 - T^3 / 38710000)
Where N is the Julian centuries and T is the Julian centuries squared.
01
Check if the mean sidereal time is greater than or equal to 0. If not, add 360 degrees to the mean sidereal time.
02
Convert the mean sidereal time from degrees to hours by dividing it by 15.
03
Round the result to the desired level of accuracy.
04
The final value is the approximate sidereal time for the given date and time.
Who needs approximate sidereal time?
01
Astronomers: Approximate sidereal time is commonly used in astronomy for calculating the positions of celestial objects. It helps astronomers accurately determine the right ascension and declination of stars, planets, and other celestial bodies.
02
Astrologers: Some astrologers incorporate sidereal time in their calculations for determining horoscopes and astrological placements. Approximate sidereal time allows for more accurate astrological predictions based on the positions of the celestial bodies.
03
Navigation and Timekeeping: Navigators and timekeepers may use approximate sidereal time in celestial navigation and precise timekeeping. It helps in determining the position of a ship or aircraft using star sightings and is also used in certain timekeeping systems.
Overall, approximate sidereal time is a useful tool for various professionals and enthusiasts who deal with astronomy, astrology, navigation, and timekeeping. It provides a reference point based on the rotation of the Earth with respect to the distant stars, allowing for more accurate calculations and predictions.
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What is approximate sidereal time?
Approximate sidereal time is the hour angle of the vernal equinox, measured in sidereal time.
Who is required to file approximate sidereal time?
Astronomers and scientific institutions are required to file approximate sidereal time.
How to fill out approximate sidereal time?
Approximate sidereal time can be filled out by calculating the hour angle of the vernal equinox.
What is the purpose of approximate sidereal time?
The purpose of approximate sidereal time is to track the position of celestial objects in the sky.
What information must be reported on approximate sidereal time?
The hour angle of the vernal equinox must be reported on approximate sidereal time.
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