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advantages to the analog planisphere:
a. won't beam dangerous rays, unlike your smartphone
b. won't distract your vision when stargazing
disadvantages:
a. distortion
b. the space for constellations around celestial pole will be less than deserved.
2.
milky way -> a galaxy where solar system dwells, having a neighbour called andromeda. spiral shaped.
3.
dengan metode paralaks, yaitu dengan melihat pergeseran dua titik tetap relatif satu terhadap lainnya, dilihat dari point of viewnya pengamat. jadi, pengamat mesti melihat pergerakan benda langit selama bumi berevolusi. cara lain adalah dengan mengukur terang suatu bintang, sehingga dapat ditaksir kuat cahaya sebenarnya bintan itu. metode ini disebut magnitudo mutlak bintang. selain itu, ada pula yang menjadikan bintang cepheid sebagai patokan jarak untuk mengukur bintang lain.
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