The duration of the true solar day

[ricci]

The interval of the time between two consecutive transits of the center of the Sun trough the meridian of a given place is called a true solar day. This interval is not constant but varies between 23h59m39s and 24h0m30s, with the present values of the obliquity of the ecliptic...

www.pierpaoloricci.it/dati/giornosolarevero_eng.htm

[mswhin63]

Is this the effect of the planetary wobble of Earth, or something else different again.:party2: