SKY-WATCHER EQ1 User Manual

17
Pointing to the NCP
For the following examples, it is
assumed that the observing site is
in the Northern Hemisphere. In the
first case (Fig.m2), the optical tube
is pointing to the NCP. This is its
probable position following the
polar-alignment step. Since the
telescope is pointing parallel to the
polar axis, it still points to the NCP
as it is rotated around that axis
counter-clockwise, (Fig.m1) or
clockwise (Fig.m3).
Pointing toward the western or
eastern horizon
Now, consider pointing the
telescope to the western (Fig.n1) or
eastern (Fig.n2) horizon. If the
counterweight is pointing North,
the telescope can be swivelled from
one horizon to the other around the
Dec axis in an arc that passes
through the NCP (any Dec arc will
pass through the NCP if the mount
is polar-aligned). It can be seen
then that if the optical tube needs to
be pointed at an object north or
south of this arc, it has to be also
rotated around the R.A axis.
Fig.m
1.
2.
3.
Celestial Pole
+
Fig.n
Telescope pointing West
Counterweight pointing North
Telescope pointing East
Counterweight pointing North
+
Celestial
Pole
1.
2.
Rotation of the Dec. axis
Rotation of the R.A. axis

SKY-WATCHER EQ1 Specifications

General

Brand	SKY-WATCHER
Model	EQ1
Category	Accessories
Language	English