Specification:
Whether standard parts：standard part
Material: Aluminum
Modulus: 0.5
Out Diameter:31mm
Inner Hole Diameter: 6mm
Teeth width:5mm
Pitch:1.57mm
Teeth Number: 60
Motor Gear 60T mod 0.5 bore hole 6mm
Jovan Stosic
Astronomy
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Skywatcher EQ-2 RA motor drive
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Binoculars for Astronomy: Ultimate Guide on Selecting & Buying
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How to Choose Binoculars for Astronomy and Skywatching
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Three Colours: Blue – Wikipedia
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Lunar Perigee and Apogee
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The Moon’s orbit around Earth is elliptical. The point of the orbit closest to Earth is called perigee, while the point farthest from Earth is known as apogee.
https://www.timeanddate.com/astronomy/moon/lunar-perigee-apogee.html
1.25″ 90°Zenith /plane Mirror for Eyepiece Astronomical Telescope Accessories | eBay
Jovan Stosic
1.25″ 90°Zenith /plane Mirror for Eyepiece Astronomical Telescope Accessories
Source: 1.25″ 90°Zenith /plane Mirror for Eyepiece Astronomical Telescope Accessories | eBay
Aperture synthesis
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Watch “Observing planets: optimising your views” on YouTube
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Tabetha S. Boyajian
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Andromeda Galaxy
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The Andromeda Galaxy (/ænˈdrɒmᵻdə/), also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth.[4] It is the nearest major galaxy to the Milky Way and was often referred to as the Great Andromeda Nebula in older texts. It received its name from the area of the sky in which it appears, the constellation of Andromeda, which was named after the mythological princess Andromeda.
https://en.m.wikipedia.org/wiki/Andromeda_Galaxy
Beehive Cluster
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