In this section, the user may have a general view of the major Sky events over a period of about 6.000 years, defining the month and year required for the computation.
    Different events, have different time scales though. The time scales used here are UT (Universal Time) and TDT (Terrestrial Dynamical Time) with the following correlation:

    To convert TDT to UT (Universal Time) use the following relation: UT = TD - ΔT (Delta T)

    An approximate value for delta t is provided in the calculations.
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