What is the difference between an astronomical telescope equatorial mount and a theodolite

Theodolite uses a horizontal-elevation coordinate system.

The equatorial mount uses the right ascension-declination coordinate system. The latter can counteract the Earth's rotation.

The former produces field spin when photographing. Depending on the specific model, the stability of the equatorial mount is better than that of the theodolite but heavier. In conclusion, a theodolite is suitable for visual and outing, and an equatorial mount is suitable for photography.

The main difference between an astronomical telescope equatorial mount and a theodolite is their structure, how they are used, and their application scenarios. In general, a theodolite is a simple instrument for ground observations, while an equatorial mount is a high-precision instrument for astrophotography and observations.

1.Structure: Theodolite is a simple frame that allows the telescope to rotate freely in the vertical and horizontal directions, and has two rotation axes, namely the vertical axis and the horizontal axis.

An equatorial mount, on the other hand, is a high-precision instrument that includes the right ascension axis and the declination axis, which can counteract the Earth's rotation and is used to track the movement of celestial bodies.

2.How to use: The theodolite is suitable for visual and out-of-town observations, and is easy to use, but it is not suitable for long-term astrophotography. Equatorial mounts are suitable for astrophotography and observations, but they are more complex and require precise adjustments.

3.Application scenarios: Theodolite is mainly used with terrestrial telescopes (such as geodesy, bird watching, etc.), while equatorial mounts are used for astrophotography and observation.

To sum up, the main difference between an astronomical telescope equatorial mount and a theodolite is their structure, how they are used, and their application scenarios. The theodolite is easy to operate and suitable for visual and out-of-the-road observations, while the equatorial mount is suitable for high-precision astrophotography and observations.

Abstract:The main function of theodolite is to measure the horizontal angle and vertical angle, to measure the latitude and longitude of their position, or to detect the direction of the target, the astronomical telescope uses the theodolite to accurately locate the orientation of a star, so the theodolite has a great effect on the telescope. What is the role of a telescope theodolite on a telescope.

What is the role of a telescope theodolite on a telescope.

What is a telescope theodolite.

The theodolite or high demolition azimuth frame is a simple two-axis frame that can be supported and rotated, and the two axes are perpendicular to each other, one is the vertical axis (height axis) and the other is the horizontal axis (azimuth axis). Such systems are typically used in telescopes, cameras, radio antennas, heliostats, or solar cell panels.

The role of theodolite on telescopes.

When used in astronomical telescopes, the greatest advantage of the azimuth height frame is the simplicity of the mechanism design. The main disadvantage is that the axis of rotation cannot follow the Luzhiqiao celestial body in the night sky due to the rotation of the Earth like an equatorial mount. The equatorial mount only needs to turn one axis at a constant speed to follow the night sky (Sunday movement).

The theodolite frame not only has to rotate two axes, but also has to change different speeds at any time, and even rotates the field of view of the field of view. It is also not designed to use a positioning ring to find celestial objects, but based on the advancement of microprocessors, the dual-axis drive system and the digital positioning ring have eliminated this shortcoming.

A common form of theodolite stand.

The theodolite stand in use now includes the following forms:

Telescopes for research.

Stand of the Giant Telescope (VLT): For the largest telescopes, the equatorial mount is very high and of very high quality, so it has been replaced with a computer-controlled theodolite. The simple structure of the theodolite can be greatly reduced, which is enough to develop a better tracking and image pointing mechanism.

A theodolite stand can also be structurally lowered to cover the dome of the telescope**, because telescope structures with pointing restrictions must be made stronger.

A telescope for amateur astronomy.

1. A beginner's telescope.

The theodolite stand is cheap and simple for the user.

2. Dobson Telescope.

John Dubson designed a simple theodolite stand for Newtonian mirrors and popularized them. Because of its simple structure, Dubson's innovative use of no mechanical parts on the table can be found in any grocery store with parts such as plywood, vermica, and plastic hoses combined with modern materials such as nylon and Teflon to form a frame.

3. "Goto Telescope".

Using a simple theodolite mount and a computer, clever combination to control the dual axes for tracking, has proven to be more convenient than using a single motor at the equator, which is mechanically complex. Astrophotography is more complicated because for long periods of time, a motor is also needed to turn the camera so that the field of view can match.

The equatorial instrument was created to improve on the shortcomings of the horizon device. Its main purpose is to overcome the effect of the Earth's rotation on stargazing. A set of astronomical telescopes with a standard configuration is often composed of a telescope, an equatorial mount, a tripod, and other components.

Here's what I've brought to you, and I hope it can help you.

Teach you how to use the astronomical telescope equatorial mount

1. Determine the direction of the North Star where you are standing, which can be determined using a compass. It should be noted that the compass has a partial magnetic phenomenon, and the position of the North Star is a little off, so in the actual process, the position is a little more staggered.

Align the right ascension axis of the equatorial mount in the direction of the North Star, or the opposite if it is the Southern Hemisphere. Direction. This is parallel to the axis of rotation of the Earth, so that we overcome the rotation of the Earth. We only need to turn one axis (right ascension) to easily track the stars.

2. Star searching, we move the longitude axis and latitude axis to find the star you want to observe into our field of view. At this time, it is faster to use a low-power eyepiece to look for it.

3. Track the stars and start the motor on the right ascension axis, at which time the work of the motor makes the equatorial mount rotate along the right ascension axis according to the speed of the earth's rotation - 24 hours per week). In this way, we can keep track of the celestial objects we want. At this time, you can change to a higher magnification eyepiece for a more detailed **sensitivity**, and you can also use the telescope to easily photograph the beautiful starry sky**.

4. Check and adjust, if you find that the star has a tail shadow phenomenon when observing the star, it means that the equatorial mount has not adjusted the eggplant cover and needs to be checked again!

The principle of the equatorial mount

If you want to know how to use the equatorial mount, then you must know how it works. When we are trembling and stargazing, people with a little common sense know that we are standing on the earth, and the earth is moving according to the stars you observe. The Earth is rotating, and the observed stars are orbiting around a center.

It's hard to track down both objects when they're moving. So what do we do?

Clause. First, we need to overcome the rotation of the earth itself and cancel out the rotation, which means that the earth is relatively stationary.

Clause. 2. Tracking according to the trajectory of the observed stars.

Summary. The equatorial mount is engraved with the first equatorial coordinate system, the hour angle and declination. The declination is fixed, and the angle of time changes with time, which can also be encountered through astronomical software such as Stellarium.

1.The premise of using the time angle and declination is to calibrate the polar axis, which is difficult for novices. Moreover, the general 80EQ does not have equipment for the fine calibration of the polar axis.

2.The accuracy of 80EQ is not large, and if you follow the scale on it, it can be accurate to the range of 5°, which is obviously unacceptable.

Of course, it's not that it's not without use. For example, if I want to find a certain star, and then it is the same ascension as a certain bright star, I can find the bright star, and then adjust the declination, which is a way to find a certain star.

How to use the right ascension and declination of the astronomical telescope. What do those dial numbers represent? What do you think? How to use it?

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The equatorial mount is engraved with the first equatorial coordinate system, the hour angle and declination. The declination is fixed, and the angle of time changes with time, which can also be encountered through astronomical software such as Stellarium. Personally, though, I don't recommend this approach :

1.The premise of using the time angle and declination is to calibrate the polar axis, which is difficult for novices. Moreover, the general 80EQ does not have the equipment to refine the pole bucket chain track shaft.

2.The accuracy of 80eq is not large, and if you follow the scale on it, it can be accurate to the range of 5°, which is obviously unacceptable. Of course, it's not that there is no use of value emptiness.

For example, if I want to find a certain star, and then it is the same ascension as a certain bright star, I can find the bright star, and then adjust the declination, which is a way to find a certain star.