Sidereal time converter

If a , then precession may be a problem. If b , then you should be okay. Add a comment. Active Oldest Votes. Use an app to calculate the local sidereal time LST for the current date and time t. Improve this answer. JohnHoltz JohnHoltz 6, 2 2 gold badges 15 15 silver badges 22 22 bronze badges. Sign up or log in Sign up using Google.

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Calendar Calculations. Telling Time by the Stars - Sidereal Time. Fields, an Heuristic Approach. The Irrationality of. The Number i i. The Transcendentality of. Problem : Let the vernal equinox occur at noon solar time on March 21 of a certain year. Estimate the sidereal time at pm solar time on November 29 of the same year.

Solution : Fix the earth-sun line in [inertial] space. Let the earth rotate on its axis once a day, and let the celestial sphere rotate about the celestial poles once a year. As viewed from the north celestial pole, the earth will rotate counter clockwise, and the celestial sphere, clockwise. The rotation rate of the earth is one rotation every 24 solar hours length of the solar day.

If the sidereal time is again the same at the same location , then the stars are again in the same directions in the sky. We measure the sidereal time in degrees here. It can also be measured in hours. The mean sidereal time relative to the mean equinox of the date at a particular moment as seen from a particular location is equal to.