Astronomical filter
Astronomical filter
Telescope accessory used to improve details of viewed objects.
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Readers' pathsAug 2026 – Oct 2026
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Solar viewer
Eyewear for viewing the sun.
18%
Solar telescope
Telescope used to observe the Sun.
14%
Sunlight
Light emitted by the Sun.
8.8%
Solar eclipse of May 12, 1706
Total eclipse.
8.1%
Neutral-density filter
Device in optics that reduces light intensity.
7.9%
Ultraviolet
Form of electromagnetic radiation.
7.6%
Herschel wedge
Optical prism used in solar observation.
7.5%
UBV photometric system
Wide-band photometric system used in astronomy.
5.3%
Hydrogen-alpha
Deep-red spectral line of hydrogen.
5.2%
Astrophotography
Imaging of astronomical objects.
3%
Readers come from
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Sun
Star at the centre of the Solar System.
81%
Solar viewer
Eyewear for viewing the sun.
5.8%
Lunar eclipse
Natural phenomenon wherein the Earth casts a shadow on the Moon.
4%
Sunglasses
Eyewear for protecting against bright light.
3.1%
Solar System
Planetary system consisting of the Sun and objects orbiting it.
2.8%
North America Nebula
Emission nebula in the constellation Cygnus.
0.91%
Crescent Nebula
Emission nebula in the constellation Cygnus.
0.84%
Veil Nebula
Cloud of heated and ionized gas and dust in the constellation Cygnus.
0.58%
Mylar
Polyester film.
0.46%
Heart Nebula
Emission nebula in the constellation Cassiopeia.
0.29%