HJD ENTERPRISES LLC
due to the finite speed of light · they must be reduced to a common · fixed · =  · JD) for objects at the poles of the ecliptic . Elsewhere · it is approximately an annual sine curve · i.e. ±8.3  · min (500  · 0.0058  · days). JD and HJD are defined independent of the time standard . Rather · JD can be expressed as e.g. UTC · UT1 · TT or TAI . The differences between these time standards are of the order of a minute · which is expressed in TT. While the practical choice may be UTC · the natural choice is TT. Since the Sun itself orbits around the barycentre of the Solar System · s. For second accuracy · and for objects in the main asteroid belt it would be 100  · s. In this calculation · the Moon – · which is closer than the Sun –
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500 s, 0.0058 days). JD and HJD are defined independent of the time standard . Rather, JD can be expressed as e.g. UTC, UT1 , TT or TAI . The differences between these time standards are of the order of a minute, so that for minute accuracy of timings the standard used has to be stated. The HJD correction involves the heliocentric position of the Earth, which is expressed in TT. While the practical choice may be UTC, the natural choice is TT. Since the Sun itself orbits around the bary
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