![]() ![]() On the ground, light has faded now and objects become hard to distinguish from the background or each other.In the sky, only the brightest objects will be visible, such as Venus and Mercury.Towards the end of this period, car headlamps need to be switched on and streetlamps will be lit. On the ground, you can still see everything clearly without extra illumination, you can still read a book, for example.Since we don’t know how far below the horizon the sun is, this simple guide will help you judge based on local conditions: Civil Twilight What Can I See During Twilight?Įach of the three twilights has different levels of seeing, both down here on Earth and up in the night sky. Once the sun moves more than 18° below the horizon, it is officially ‘night’ and there is no sunlight lighting your location, perfect for taking photos of the night sky. It begins when the sun is 12° below the horizon and ends when it reaches 18° below Astronomical Twilight – the last and darkest of the twilights.Nautical Twilight – starts when civil twilight ends and lasts until the centre of the sun is 12° below the horizon.Civil Twilight – begins at sunset (the centre of the sun is at 0° elevation) until it is 6° below the horizon. ![]() You may have heard of astronomical twilight (yes, it is a real thing) but it is only the last and darkest of three recognised twilight phases.Įach twilight phase is determined by how far the sun is below the horizon: So, if you want to discover more about how long it takes to get dark after the sun sets, then read on… What is Astronomical Twilight? There’s variation in that for your particular latitude, the season and how dark you want it to be, though.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |