Which is the correct origin of the geocentric coordinates?
Which is the correct origin of the geocentric coordinates?
This origin might be heliocentric (centre of the Sun), baryocentric (centre of mass of the Solar System), geocentric (centre of the Earth), or topocentric (a specific location on the Earth’s ellipsoid). So you may have heliocentric equatorial coordinates, geocentric equatorial coordinates, or topocentric equatorial coordinates.
Do you have geocentric coordinates of the Moon?
From your question I infer that you have geocentric coordinates of the Moon and you want to convert them to topocentric (not geocentric!) coordinates for an observer at a specific location (latitude and longitude) on the Earth.
How are heliocentric longitudes different from Earth’s?
On a heliospheric scale, differences are very small. For instance, the heliocentric longitudes of an L1 spacecraft at Ygse = 100 Re and the Earth differ by only 0.25 degrees Start year: Start day: Stop year: Stop day: Time resolution (in days):
How are the coordinates of the planets obtained?
In heliocentric frame, we have the coordinates of all the planets including the Earth. In geocentric frame, we’ll have the coordinates of the Sun, obtained from the heliocentric coordinates of the Earth. We know coordinates of P and E in frame R0, and we want to know the coordinates of P in R1 .
This origin might be heliocentric (centre of the Sun), baryocentric (centre of mass of the Solar System), geocentric (centre of the Earth), or topocentric (a specific location on the Earth’s ellipsoid). So you may have heliocentric equatorial coordinates, geocentric equatorial coordinates, or topocentric equatorial coordinates.
From your question I infer that you have geocentric coordinates of the Moon and you want to convert them to topocentric (not geocentric!) coordinates for an observer at a specific location (latitude and longitude) on the Earth.
How to calculate the coordinates of the Earth?
Second calculate the X o, Y o, and Z o coordinates of the observer on Earth in the equatorial system. Third, subtract the X o, Y o, and Z o coordinates of the observer from the X M, Y M, and Z M coordinates of the Moon.
How to find the coordinates of the Sun?
In geocentric frame, we’ll have the coordinates of the Sun, obtained from the heliocentric coordinates of the Earth. We know coordinates of P and E in frame R0, and we want to know the coordinates of P in R1 . and the coordinates of P in R1 . The purpose is to find x 1, y 1, z 1 from x 0, y 0, z 0 .