probably appear best with glasses on. This is
because a telescope’s focuser can accommodate
for nearsightedness or farsightedness, but not
astigmatism. Astigmatism, however, is less a
problem at higher magnification.
Appendix
Jovian (Jupiter's) Satellite Positions
https://in-the-sky.org/jupiter.php
The satellite positions are represented graphically
for a month at a time as wavy lines. Io 's line is
orange; Europa's, yellow; Ganymede's Red;
Callisto's Blue.
Mutual Jovian Satellite Events
http://www.projectpluto.com/jevent.htm
Times are in Universal Time (UT). For EST
subtract 5 hours from UT. For EDT subtract 4
hours from UT. Note that the evening hours in
Michigan are actually early the next day in UT.
After 2015 it will be 5 ½ years before these types
of events occur again.
Finding your way around the sky
Books on constellations, star charts or star atlases
may be consulted or borrowed from the library.
With these you can learn the constellations and
find your way around the sky.
A monthly star chart for the Grand Traverse Area
can be found at http://epemeris.bjmoler.org along
with a list of planetary events for the month.
There are also commercial and free star chart
programs on the Internet. Here are some free
ones listed in order of ease of use.
• Stellarium: http://www.stellarium.org. For
older computers use version 0.12… For
newer ones you can use version 0.13…
This shows a very realistic sky.
• Sky Charts: http://astrosurf.com/astropc/.
This is a good program for use out with
the telescope.
• Hallo northern sky:
http://www.hnsky.org/software.htm. This
one looks bare bones but there are a lot of
hidden features. It is the hardest to use.
Some Interesting Stars
Alberio (β Cygni) The star in the beak of Cygnus
the swan or the foot of the Northern Cross is a
blue and Gold binary star. Visible in the evening
from late spring to late autumn.
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