Celestial Navigation

Later on, TDT was shortened into Terrestrial Time (TT) - Moscow uses mean solar time, while New York uses ______ time

For the years earlier than 1988(Astronomical Almanac for 1988), the exact difference change in T = TD – UT can be deduced only from ______

Sidereal time is based on the positions of stars relative to the ______

Solar time is defined according to the Sun’s position relative to the ______

Hour angle (HA) of any object on the celestial sphere to be the time since it last crossed the ______

If a star crossed the meridian 3 hours ago, its hour angle is ______

If a star will cross the meridian 1 hour from now, its hour angle is ______

By convention, time by the stars is based on the hour angle of the ______ equinox

The length of a tropical year is about ______ days

For the values earlier than 1955 have been slightly corrected using Chapront’s new value n’ = -25.7376”/century2 for the tidal acceleration of the ______