Modeling the local horizon
This step is more conveniently done in daytime when one can see the horizon obstructions
more clearly. The horizon measurements are made by pointing the telescope at various points
along the local horizon, and recording the altitude (in degrees) and azimuth (in degrees,
measured north through east, from 0 to 360 deg) of each point. The points should be more
closely spaced at those portions of the horizon where the altitude changes more rapidly
with azimuth (e.g., trees, house walls, etc.). A relatively complex sample horizon line is
The azimuth and altitude data for the local horizon line should be entered in a text file
(horizon model), with the following format:
! Example horizon model
! August 19, 2004
! Azimuths (first column) and altitudes (second column) are given in
! degrees. Azimuth is measured from North (0 deg) through East (90 deg),
! and varies from 0 to 360 deg. Data points must be listed in order
! of ascending azimuth.
In a horizon model, comment lines start with "!" and are ignored; blank lines are also ignored.
Horizon models are usually saved to directory
This sample horizon model (TAO\schedule\horizon.txt)
may be used as a template for creating your own horizon models. If you use more
than one telescope, each one may have its own local horizon line.
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© 1999-2004 Paulo Holvorcem