What is an hour disk?
The hour unit is used in astronomy, especially for astrophotography. It is a piece of equipment that is connected to the movement of the telescope. The use of an hourly unit with a telescope ensures that the field of view remains the same at all times or that the binoculars move at the same speed as the Earth to watch what it looks.
Due to the rotation of the Earth, objects move over time over time. Before the invention of hourly units, astronomers would have to manually move their telescopes to compensate for the country's movement. Hourly units made it possible to become automatic movement, so astronomers can focus on what they watch without having to move and back their binoculars. Sidereal Day is a time that takes the Earth to complete the full rotation compared to the spring equinox or the spring Ekvinemox that passes through the sun in March. Every stellar day is about four minutes shorter than a solar day or a day measured on the basis of rotation of the earth around the sun. Sidereal Time AstronomersThey use to know where to direct their telescopes to look at a particular star at the night.
Original units were often driven by declining weights and pendulums, similar to what can be seen in the grandfather's lessons. Current clock units are now electrically powered using the right rise engine. In most cases, the drive drive is attached to the binoculars holder. The engine is then connected to the driving gravel, either directly or through the gear system. Fastening the hourly unit to the binoculars of the binoculars means that the holder moves and not the telescope that is focused and the angle of the telescope at all times and it is just around the axis.
The hour unit can be an integral part of the equipment for astrophotographs. Constant slow movement of the clock ensures that the telescope smoothly follows the star of the choice. This in turn allows the acquisitionEating photos at different intervals because the star moves around the sky. By attaching the hourly unit and the cameras directly to the telescope, the amount of manipulation with the photographer will significantly reduce as soon as the telescope is originally set. This means that for a long time there is less chance of human error.