Calculation of parameters and characteristics of telescopes using different eyepieces and visualization.

Settings:
- language (Russian, English, Hungarian, Spanish, German, French, Romanian, Croatian, Italian, Sinhala, Norwegian, Persian, Polish, Japanese, Portuguese, Korean, Catalan, Dutch, Arabic, Greek, Malay, Luxembourgish, Hindi, Indonesian , Ukrainian, Hebrew, Sardinian, Czech, Swedish, Finnish, Chinese, Bengali, Tamil, Slovenian, Turkish, Bosnian, Thai, Bulgarian, Vietnamese)
- scale
- text font size
- input by the slider
- comparison of telescopes
- bookmarks
- Moon phases
- help
- swipe

Telescope:
- List of telescopes
- Diameter
- Focal length
- Focuser

Eyepiece:
- Eyepiece list
- Focal length
- Field of view
- Barlow lens

Camera:
- list of cameras
- pixel size
- image size
- matrix size
- Binning

Calculations:
- Magnification
- Stellar magnitude
- Field of view
- Maximum field of view
- f-number
- Diameter of exit pupil
- Angular resolution
- Size of craters on Moon
- 2D, 1.4D, 1D, 0.7D, 0.5D

- Sun
- ISS

Planets:
- Mercury
- Venus
- Earth
- Mars
- Jupiter
- Saturn
- Uranus
- Neptune
- Pluto


Asteroids:
- Ceres
- Pallas
- Juno
- Vesta
- Ida
- Gaspra

Satellite:
- Moon
- Titan
- Io
- Europa
- Ganymede
- Callisto
- Titania
- Ray

Messier:
M1, M8, M13, M16, M17, M20, M27, M31, M33, M42, M45, M51, M57, M58, M63, M64, M74, M78, M81, M82, M83, M88, M97, M99, M100, M101, M104, M108

NGC:
891, 2359, 2392, 2440, 4565, 4631, 5189, 6302, 6543, 6960, 6979, 7000, 7662

IC:
1805, 1848, 2118