By Dr. rer. nat. Oliver Montenbruck, Dipl.-Ing. Thomas Pfleger (auth.)

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Instead of right ascension RA and 32 2. Coordinate Systems declination DEC we now have ecliptic longitude L and latitude B. As in the previous step, the distance remains unchanged. 00000000 It is now possible to convert the given coordinates from geocentric to heliocentric coordinates using option H. COCO does not check in any way to determine in which of these two systems the actual data are expressed. It is therefore possible to call options H or G several times one after the other, but the results will be meaningless!

Finally, we have to take into account a whole series of corrections that affect the height of the observed horizon. Only after these steps will we return to the equation just mentioned. 2 Sun and Moon Calculation of rising and setting does not make demands for a high degree of accuracy in the coordinates of the Sun and the Moon. The MINI_SUN and MINI_MOON procedures therefore contain only the most important terms describing the respective orbits. They are greatly reduced versions of SUN200 and MOON, which will be described in detail in Chap.

The azimuth, determined by rotating the theodolite around its vertical axis, is defined as the angle between the South point and the required position. On this basis, the azimuth of the West point is A = 90° and, correspondingly, for the East point A = 270° (or A = -90°). Unfortunately, alongside the definition just given, there is a second one that is used, in particular, in navigation. Here, azimuth is taken to originate at the North point. According to this method, the East point therefore has an azimuth of 90°.

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