![]() ![]() Simplification of these algorithms, while keeping a reasonableĪccuracy. ![]() Precision formulae for planetary positions", published in theĪstrophysical Journal Supplement Series, 1980. These algortihms were developed by myself back in 1979, based on a Performed as a rotation along the ecliptic. ![]() In the latter case,Ĭorrection for precession must be applied, which is most simply Position on a star map drawn for a fixed epoch. Is suitable for computing rise/set times, but not for plotting the The positions computed below are for the 'equinox of the day', which ignoring the differenceīetween mean, true and apparent positions. ![]() Planets, about one arc minute for the outer planets, and 1-2 arc Positions is a fraction of an arc minute for the Sun and the inner The algorithms have been simplified as much as possible while still Moon and the major planets, as well as for comets and minor planets, Forewordīelow is a description of how to compute the positions for the Sun and Links to other sites Tutorial with numerical test cases Computing rise and set times 0. The elongation and physical ephemerides of the planets Perturbations of Jupiter, Saturn and Uranus The position of the Moon and of the planets Computing planetary positions How to compute planetary positions ![]()
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