5.
EVO-zero Alignment in Equatorial Mode.
The mount alignment in equatorial mode consists of adjusting the mount’s altitude and latitude
such that its declination axis points exactly to the celestial North Pole.
To perform such an adjustment, the actions necessary to set the altitude and the latitude of the
mount to those of the observation site are described here. For more precise alignment, the polar-
scope provided with the mount (or a different type of optional polar-scope) is used.
5
.1
Precise Latitude Adjustment
To correctly use the mount it is
necessary to make the mount’s DEC axis
parallel to the Earth’s axis of rotation.
The process of approximate latitude
adjustment was described earlier. In this
section it is assumed that the mount has
been previously adjusted roughly to the
latitude of the observation site.
Next, the mount’s polar axis must be
adjusted to an angle equal to the latitude
of the observation site. For example the
latitude of Paris is about 49°, London
about 51.5°, San Francisco about 38°
and Tokyo about 35°. The toothed
adjustment wheel (1) controls the angle and the latitude scale (2) on the mount side indicates
the mount’s latitudinal angle.
To increase the latitude (raising) of the
mount’s polar axis, the knurled wheel
(1) must be turned clockwise. To
decrease the latitude, the wheel must be
rotated counter-clockwise.
The latitude adjustment range is
between 0° and 90°.
NOTE:
In general it is preferable to
perform the precise latitude
adjustments by moving the mount
opposite to the force of gravity, i.e.
raising the mount polar axis.
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Summary of Contents for EVO-ZERO
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