Aligning the R.A. Setting Circle

5.Using the altitude and azimuth adjustment screws (#14 & #20), move the mount until Polaris is in the field of view of the finderscope. Rough adjustments in azimuth can be made by moving the tripod.

6.Center Polaris using the altitude and azimuth controls. Remember, do not move the telescope in

R.A. and DEC. You want to adjust the direction the polar axis is pointing and you are using the telescope to see where the polar axis is pointing.

This gets you close to the pole but not directly on it. In order to improve your accuracy for more serious observations and photography Celestron offer an optional Polar Axis Finderscope (#94221) that fits into the polar axis of the mount.

Before you can use the setting circles to find objects in the sky you need to align the R.A. setting circle. The declination setting circle is aligned during the process of polar alignment.

In order to align the R.A. setting circle, you will need to know the names of a few of the brightest stars in the sky. If you don’t, they can be learned by using the Celestron Sky Maps (#93722) or consulting a current astronomy magazine.

To align the R.A. setting circle:

1.Locate a bright star near the celestial equator. The farther you are from the celestial pole the better your reading on the R.A. setting circle will be. The star you choose to align the setting circle with should be a bright one whose coordinates are known and easy to look up.

2.Center the star in the finderscope.

3.Look through the main telescope and see if the star is in the field. If not, find it and center it.

4.If you purchased an optional motor drive, start it now so that it will track the star.

5.Look up the coordinates of the star.

6.Rotate the circle until the proper coordinates line up with the R.A. indicator (the zero mark on the vernier scale). The R.A. setting circle should rotate freely.

NOTE: Because the R.A. setting circle does NOT move as the telescope moves in R.A., the setting circle must be aligned each time you want to use it to find an object. This holds true even if you are using an optional motor drive. However, you do not need to use a star each time. Instead, you can use the coordinates of the object you are currently observing.

Once the setting circles are aligned you can use them to find any objects with known coordinates. The accuracy of your setting circles is directly related to the accuracy of your polar alignment.

1.Select an object to observe. Use a seasonal star chart to make sure the object you chose is above the horizon. As you become more familiar with the night sky, this will no longer be necessary.

2.Look up the coordinates in an atlas or reference book.

3.Hold the telescope and release the DEC clamp.

4.Move the telescope in declination until the indicator is pointing at the correct declination coordinate.

5.Lock the declination clamp to prevent the telescope from moving.

91510 specifications

The Celestron 91510 is a remarkable telescope that offers astronomy enthusiasts a blend of quality, portability, and advanced features, making it a popular choice for both beginners and seasoned stargazers alike. Known for its impressive optics, the Celestron 91510 utilizes a 70mm refractor design that provides bright and clear images, ideal for observing celestial objects such as planets, stars, and deep-sky phenomena.

One of the standout features of the Celestron 91510 is its fully coated optics, which enhance light transmission and improve image quality. This ensures that users can observe fine details in celestial bodies, such as the rings of Saturn or the craters on the Moon. The telescope comes with two eyepieces of different focal lengths, allowing for varying magnification. This versatility enables users to explore the night sky with ease, offering both wide-field views of star clusters and higher magnification for detailed observations.

Portability is another significant advantage of the Celestron 91510. Designed with travel in mind, this telescope is lightweight and compact, making it easy to set up and transport. It features a sturdy yet portable mount that provides stable support during observations. The pan-and-tilt head allows for smooth tracking of celestial objects, ensuring that users can focus on their targets without hassle.

Moreover, the telescope includes a red dot finder which aids in locating objects quickly in the night sky. This user-friendly feature is especially beneficial for beginners who may find it challenging to navigate the stars. The adjustable tripod provides a stable base and can be set to various heights, ensuring comfort during extended viewing sessions.

Celestron's commitment to quality and innovation is evident in the design of the 91510. It incorporates durable materials that withstand the rigors of outdoor use, ensuring longevity. Additionally, the telescope's overall aesthetic appeal, complete with a sleek design, adds to the enjoyment of using this astronomical instrument.

In summary, the Celestron 91510 is an excellent choice for anyone looking to delve into the wonders of astronomy. With its high-quality optics, user-friendly features, and portability, it offers an enjoyable stargazing experience. Whether you are a novice wanting to explore the cosmos or an experienced astronomer seeking a reliable companion, the Celestron 91510 stands out as an exceptional option.