![]() Instance, from 1968 to 1980 Delta T increased by about 1 second per year, but from December 1997 to December 1998 There are irregular (and hence unpredictable) fluctuations. The bad thing is that Delta T is not increasing uniformly. Shift the central line (and all other limits) over 1 degree in the East (or West) direction, the geographical latitudes ![]() Knowing that 1 degree corresponds to 4 minutes of time, an error of 240 seconds in Delta T would Indeed, this position depends on Delta T because during the time interval Delta T theĮarth is rotating. ![]() Occultation, but also for determining the position of the central line or the zone of visibility (graze line in the case ofĪn occultation, for instance). Delta T is needed not only for the calculation of exact times of an eclipse or The quantity Delta T increases with time, and this occurs more and more rapidly, because the rate of I cannot go into great details here, so let me limit to the following.ĭelta T is the difference (at a given instant) between the uniform time-scale known as Dynamical Time, and the The quantity Delta T is very important in the calculation of solar eclipses and occultations by the Moon.
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