{"id":46560,"date":"2023-06-20T07:28:58","date_gmt":"2023-06-20T07:28:58","guid":{"rendered":"https:\/\/www.skyatnightmagazine.com\/?p=119536"},"modified":"2023-06-20T07:32:31","modified_gmt":"2023-06-20T07:32:31","slug":"how-earths-orbit-affects-our-view-of-the-night-sky","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/rss_feed\/how-earths-orbit-affects-our-view-of-the-night-sky\/","title":{"rendered":"How Earth\u2019s orbit affects our view of the night sky"},"content":{"rendered":"

The stars and constellations appear to move throughout the year. But it’s not the stars that are moving – it’s us. <\/p>

By Katrin Raynor\n \t\t<\/p>

Published: Tuesday, 20 June 2023 at 12:00 am<\/p>

\n\n

When you look to the night sky over the course of a year, you\u2019ll notice that it changes.<\/p>\n

Constellations<\/a> not only shift their position from night to night, but come and go as the seasons change.<\/p>\n

Each season has its own sky, with its own prominent constellations \u2013 which is why Orion<\/a>, for example, dominates the winter sky but is absent in summer.<\/p>\n

These changes are entirely due to the motion of Earth and are nothing to do with the stars far out in space.<\/p>\n

As Earth orbits the Sun<\/a>, it moves around the host star by approximately one degree a day and at the same time is completing one rotation every 23 hours and 56 minutes.<\/p>\n

This is why we see the constellations shift westwards by one degree each night and rise in the east four minutes earlier.<\/p>\n

\""It\u2019s\"<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>
It\u2019s Earth\u2019s motion through space that makes the constellations we see change throughout the year<\/span><\/figcaption><\/div>\n

We can even see the effect of Earth\u2019s rotation within one evening.<\/p>\n

Head out and find a bright star in the night sky, and remember its position relative to a terrestrial object like a lamp post or a distant tower.<\/p>\n

Head outside again two hours later, stand in the same spot in your garden and you\u2019ll see that the star has appeared to move in the sky.<\/p>\n

This apparent motion is often captured by astrophotographers by taking long exposure images known as star trails<\/a> (which you can see in the image at the very top of this article).<\/p>\n

And this movement of stars means it is possible to calculate the speed of Earth\u2019s rotation by observing the night sky<\/a>.<\/p>\n

Over the course of the year, whole constellations seem to come and go.<\/p>\n

Other constellations close to the north celestial pole in the night sky are visible all year round, and these are known as circumpolar constellations.<\/p>\n

What this all essentially means is that as Earth goes around the Sun spinning like a top, our view changes as we look out at different parts of the Universe at different times of the year.<\/p>\n

This guide originally appeared in the June 2023 issue of BBC Sky at Night Magazine.<\/strong><\/em><\/p> <\/body><\/html>\n

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