Source link : https://bq3anews.com/why-are-some-stars-at-all-times-visual-whilst-others-come-and-move-with-the-seasons/
As an area scientist, each and every time I’m going out of doors with my circle of relatives, I inform my kids to seem up on the sky. The entrance door of our house appears to be like southeast, and on wintry weather nights the constellation Orion hangs majestically simply above the horizon as quickly because it grows darkish sufficient to peer stars.
One summer season evening, my son got here operating in and exclaimed, “Dad, Orion’s not there!” It used to be time for his first actual astronomy lesson.
We went out of doors and I requested him to seek out the Giant Dipper, the simply identifiable development of stars that make up a portion of the constellation Ursa Main. I reminded him that lets at all times see the Giant Dipper it doesn’t matter what time of the 12 months it used to be.
So, why is it that Orion isn’t at all times visual within the evening sky, and by no means in the similar location month after month, whilst the Giant Dipper at all times is? The solution is in detail tied to a couple of ideas: how astronomers measure the period of an afternoon, the movement of the Earth across the Solar right through a 12 months, and the cadence with which stars upward thrust and set evening after evening.
Sidereal time
When you glance eastward on the similar hour for 2 nights in a row, you’ll to find that the celebrities appear to be in the similar position. However they’re no longer, and this motion turns into obvious should you proceed staring at…
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Author : bq3anews
Publish date : 2026-03-06 04:30:00
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