His observations on eclipses were still used centuries later in Simon Newcomb's investigations on the motion of the moon, while his other observations inspired Laplace's " Obliquity of the Ecliptic " and " Inequalities of Jupiter and Saturn ".
22.
Note that although the precession and the tilt of Earth's axis ( the obliquity of the ecliptic ) are calculated from the same theory and thus, are related to each other, the two movements act independently of each other, moving in mutually perpendicular directions.
23.
The wide variance of these dates from historically accepted ones led the architect and archaeologist, William Bell Dinsmoor, to mistrust dates established by the slowly changing obliquity of the ecliptic or by stellar alignments, which involve an arbitrary selection of a star that rises on the proper azimuth.
24.
The Sun and the planets do not move in these parallel paths but along another circle, the ecliptic, whose plane is at an angle, the obliquity of the ecliptic, to the axis, bringing the Sun and planets across the paths of and in among the stars .*
25.
The rotation axis of the Earth describes, over a period of 25, 700 years, a small circle ( blue ) among the stars, centered on the ecliptic north pole ( the blue " E " ) and with an angular radius of about 23.4? an angle known as the obliquity of the ecliptic.
26.
Al-Khazin was one of the scientists brought to the court in Ray, Iran by the ruler of the Buyid dynasty, Adhad ad-Dowleh, who ruled from 949 to 983 AD . In 959 / 960 Khazini was required by the Vizier of Ray, who was appointed by ad-Dowleh, to measure the obliquity of the ecliptic.
27.
Because the Earth's equator is itself inclined at an angle of about 23.5?to the ecliptic ( the obliquity of the ecliptic, \ epsilon ), these effects combine to mean that the inclination of the Moon's orbit to the equator varies between about 18.4?and 28.6?over the 18.6 year period.
28.
:: As seen from the Earth, the Sun appears to move along the ecliptic, which is different from the celestial equator ( the position of the stars that always pass overhead at the equator ), due to the obliquity of the ecliptic ( i . e . the fact that the Earth's axis isn't perfectly perpendicular to the direction of the Sun ).
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