Bushnell 78-9675 - Manual (Page 5)

1. First determine your targeted object. Any bright object in the night sky is a good starting point. One of the
favorite starting points in astronomy is the moon. This is an object sure to please any budding astronomer or
experienced veteran. When you have developed proficiency at this level, other objects become good
targets. Saturn, Mars, Jupiter, and Venus are good second steps to take.
2. Avoid the temptation to move directly to the highest power. The low power eyepiece will give you a
wider field of view, and brighter image--thus making it very easy to find your target object. At this point
with a focused image, you've passed the first obstacle. Once you pass this step, you'll will enjoy the time
spent with your telescope. Every celestial object you center in the telescope will be easily focused, which is
important for continuing your exploration of the night sky.
3. The low power eyepieces are perfect for viewing the full moon, planets, star clusters, nebulae, and even
constellations. These should build your foundation. However, for more detail, try bumping up in
magnification to higher power eyepieces on some of these objects. During calm and crisp nights, the
light/dark separation line on the moon (called the "Terminator") is marvelous at high power. You can see
mountains, ridges and craters jump out at you due to the highlights. Similarly, you can move up to higher
magnifications on the planets and nebulae. Star clusters and stars are best viewed through the low power
no matter what.
4. The recurring astronomical theater we call the night sky is an ever-changing billboard. In other words, not
the same movie plays all the time. Rather, the positions of the stars change not only hourly as they seem
to rise and set, but also throughout the year. As the earth orbits the sun our perspective on the stars changes
on a yearly cycle about that orbit. The reason the sky seems to move daily just as the sun and the moon
"move" across our sky, is that the earth is rotating about its axis. As a result you may notice that after a
few minutes or a few seconds depending on what power you are viewing at, the objects in your telescope will
move. At higher magnifications especially, you will notice that the moon or Jupiter will "race" right out of
the field of view. To compensate, just move your telescope to "track" it in the necessary path.
Helpful Hints
Your telescope is a very sensitive instrument. For best results and fewer vibrations set your telescope up on a
level location on the ground rather than your concrete driveway or your wooden deck. This will provide a more
stable foundation for viewing, especially if you've drawn a crowd with your new telescope.
If possible view from a location that has relatively few lights. This will allow you to see much fainter objects.
You'd be surprised how much more you'll see from your local lake or park when compared to a backyard in the
city.
Using your telescope out a window is NEVER recommended.
View objects that are high in the sky if possible. Waiting until the object rises well above the horizon will
provide a brighter and crisper image. Objects on the horizon are viewed through several layers of earth's
atmosphere. Ever wonder why the moon appears orange as it sets on the horizon. It's because you are looking
through a considerable more amount of atmosphere than you would directly overhead. (Note: If objects high in
the sky are distorted or wavy, you are probably viewing on a very humid night.) During nights of unstable
atmosphere, viewing through a telescope can be frustrating if not impossible. Astronomers refer to crisp, clear
nights as nights of "good seeing."