know that the axis that forms the Earth to the Sun, along with the axis joining the Sun in its apparent motion around the Earth, forming an angle is called declination. This angle is zero during the equinoxes (days last night and the day the same number of hours: 21 March and 21 September or thereabouts), and reaches its highest value in the solstices (jnuio 21 (longest day) and December 21 (longest night). If we represent the variation n of decline over
Julian year of 365 days, we get a sinusoidal wave.
Alcad
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