addendum 25.8.a longitude and latitude in the eclipticastelsel
to 25.8 The aspect
Longitude and latitude in the ecliptic system
The basis of this system is formed by the plane of the Ecliptic. In this plane, starting from the centre of the Earth, the North-South axis of the Ecliptics is erected. This axis in turn provides the suspension points for the great circles from which the latitude co-ordinates can be read.
fig. 25.8.a: The ecliptic system
From the same point of observation, we will view the Ecliptic System from an ever-changing angle, according to the progress of the seasons.
The co-ordinates of this system are called longitude and latitude degrees.
This is the system used in the Ephemeris and the Nautical Almanac, to indicate the positions of the planets.