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♚. Leo Tsukinaga.
↳ Gryffindor.
1. Planisphere → a map that is formed by the projection of a sphere, or part of a sphere on a plane, especially an adjustable circular star map that shows the appearance of the heavens at certain time and place.
Advantages:
- Giving a view of what’s overhead at that particular time.
- Containing only the bright stars and constellations, makes finding the basic patterns easier.
- They are flat, light, and portable.
Disadvantages:
- Are lalitude specific; you’ll need to buy a new one if you want to stargaze while being on holiday in a different part of the world.
- Aren’t very detailed, so they won’t help to track down many faint fuzzier or dimmer stars.
- Can be difficult to master at the first few times using them for the first time, especially because you have to hold them above your head to read properly.
2. Milky Way → the galaxy that contains our Solar System. 'Milky' came from the appearance from the Earth of the galaxy; a band of light that could be seen in the night sky that cannot be recognized by an individual and by naked eye alone. 'Milky Way' is a translation of the Latin via lactea, from the Greek γαλαξίας κύκλος (galaxías kýklos), which means 'milky circle'.
3. Scientists measured the positions of celestial objects before telescope was found → was by almanac, by using an astronomy instrument named astrolab, by measuring the brightness of a star.
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