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  1. Epoch versus equinox

    Astronomical data are often specified not only in their relation to an epoch or date of reference but also in their relations to … See more

    Changing the standard equinox and epoch

    To calculate the visibility of a celestial object for an observer at a specific time and place on the Earth, the coordinates of the object are needed relative to a coordinate system of the current date. If coordinates relative to s… See more

    Specifying an epoch or equinox

    Epochs and equinoxes are moments in time, so they can be specified in the same way as moments that indicate things other than epochs and equinoxes. The following standard ways of specifying epochs and equinoxes … See more

    Besselian years

    A Besselian year is named after the German mathematician and astronomer Friedrich Bessel (1784–1846). Meeus 1991, p. 125 defines the beginning of a Besselian year to be the moment at which the mean longitude of … See more

    Julian years and J2000

    A Julian year is an interval with the length of a mean year in the Julian calendar, i.e. 365.25 days. This interval measure does not itself define any epoch: the Gregorian calendar is in general use for dating. But, standard c… See more

    Epoch of the day

    Over shorter timescales, there are a variety of practices for defining when each day begins. In ordinary usage, the civil day is reckoned by the midnight epoch, that is, the civil day begins at midnight. But in older astronomic… See more

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