খ-গোলক: সংশোধিত সংস্করণের মধ্যে পার্থক্য
বিষয়বস্তু বিয়োগ হয়েছে বিষয়বস্তু যোগ হয়েছে
বট নিবন্ধ পরিষ্কার করেছে, কোন সমস্যা? |
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৪ নং লাইন:
== খ-গোলকের রাশিসমূহ ==
These concepts are important for understanding celestial reference systems, the methods in which the positions of objects in the sky are measured. Certain reference lines and planes on the celestial body, when projected onto the celestial sphere, form the bases of the reference systems. These include the celestial equator, axis, and the orbit. At their intersections with the celestial sphere, these form the celestial equator, the north & south celestial poles and the ecliptic, respectively.[6] As the celestial sphere is considered infinite in radius, all observers see the celestial equator, celestial poles and ecliptic at the same place against the background stars.
Directions toward objects in the sky can be quantified by constructing, from these bases, celestial coordinate systems. Similar to the terrestrial longitude and latitude, the equatorial system of right ascension and declination specifies positions relative to the celestial equator and celestial poles. The ecliptic system of celestial longitude and celestial latitude specifies positions relative to the celestial body's orbit. There are more coordinate systems besides the equatorial right ascension/declination system and the ecliptic system.
==আরও দেখুন==
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