Since there is no mark that points at the North Celestial
Pole, you need to match the polar axis of your SXD2 mount
with the N.C.P using the conspicuous polar star and two
stars in the same area of the sky.
Your goal is to set Polaris to the edge of the line on the
side of 2014, and both Delta UMI and 51 Cep are to be set
to the middle of the curved lines of the position scale at the
protruded edge on the side of 15 respectively. (In case of
the year 2014)
Precession of the Equinoxes
The locations of Polaris, Delta UMi
and 51 Cep on the position scales
change year by year due to precession of
the Earth. You need to compensate the
locations of the 3 stars on the position scales yearly.
Turn the polar alignment scope body so that Delta UMi
comes near to the location of the year 2014 on the scale.
And then, Polaris will get out of position from the gap
between the lines.
Adjust the red light illumination to be dimmer if the reticle is
too bright to see the 4th magnitude Delta UMi.
If the 5th magnitude 51 Cep is hard to see in the polar
alignment scope’s field of view, at least be sure to set Delta
UMI to the position scale on the reticle.
★
The movement of Polaris from
2014 to 2040 by precession
The movement of 51 Cep from
2014 to 2040 by precession
The movement of Delta UMi from
2014 to 2040 by precession
★
★
Polaris is out of place from the designated position. This is part of the process.
Chapter 5 APPLICATION
Celestial north Celestial north
Center of the polar alignment scope’s field of view
(Center of the rotational axis of the equatorial mount)
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