Tag Archives: hemispheres

Think – Today: Why Is There 360 Degrees In A Circle?

by Anura Guruge

360360º in a circle (as opposed to say 100 or 200)? Why? Where did it come from?

Think first, then research, then THINK again. Think for the pleasure of thinking.

Yesterday’s ‘Think’: How many stars can you see naked eye? Lot depends on your own eyesight, where you are and light pollution. There used to be a general consensus that it was (on average) around 3,500 stars. Best case, it would never be over 6,000. But now we have a more definite answer thanks to Yale University professor, Dorrit Hoffleit. She counted all the stars up there with a ‘visibility index’ (so called ‘apparent magnitude’) of 1 to 6.5 — the normal range associated with naked eye visibility. She found a total of 9,096 across BOTH hemispheres, i.e., North & South. So that gives us (roughly) 4,548 a hemisphere. So, the original 3,500 wasn’t a bad guess and probably still holds true given eyesight variation AND increasing light pollution.

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by Anura Guruge