Sidereal Time

💫

The Hour Angle of the Vernal Point. Mean Sidereal Time is measured by the diurnal motion of the mean Vernal Point ("mean equinox of date"), which is affected the secular quantities of Precession; Apparent Sidereal Time is measured by the position of the true Vernal Point ("true equinox of date"), which is affected by Nutation. The difference (Apparent minus Mean) is called the Equation of the Equinoxes (called Nutation in Right Ascension, before 1960). Apparent Sidereal Time on the observer's meridian is called LST (Local Sidereal Time); on the Greenwich meridian, it is called GST (Greenwich Sidereal Time). The difference (LST-GST) is equal to the geographic longitude of the observer. The value of GST is tabulated in an ephemeris under the heading "ST" or "Sidereal Time." The argument used to compute the GST is the UT (Universal Time), which differs from the ET (Ephemeris Time) used to compute the planets. Sidereal Time is a direct measure of the diurnal rotation of the Earth, and is, therefore, independent of the value of Delta-T.

Comments: Sidereal Time

B i Ʉ

9

+

1

Refresh
Daily horoscope

GotoHoroscope's mobile App for your Zodiac sign. Available on Google Play
Google Play and the Google Play logo are trademarks of Google LLC.

Aries

horoscope

Taurus

horoscope

Gemini

horoscope

Cancer

horoscope

Leo

horoscope

Virgo

horoscope

Libra

horoscope

Scorpio

horoscope

Sagittarius

horoscope

Capricorn

horoscope

Aquarius

horoscope

Pisces

horoscope

Copyright © 2024 GotoHoroscope, all rights reserved. Developed by GotoHoroscope.com. Contact Us or check Site Map.