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What is the difference between astronomical twilight and night?
When the Sun is 18 degrees below the horizon.
When the sun is nine degrees below the horizon which phase of twilight is it?
The sun being nine degrees below the horizon indicates that it is in the civil twilight phase. At this point, there is still enough light for most outdoor activities without the need for artificial lighting.
How many twilights are they and what are they called?
4. The first one is called Twilight. The second one is called New Moon The third one is called Eclipse. The fourth one is called Breaking Dawn. Plus there is a novella called The Second Life Of Bree Tanner.
How can you tell the difference between astronomical twilight and night?
Here's the formula: From sunset until the Sun is six degrees below the horizon is civil twillight. It's still light enough to read. When the Sun is six to twelve degrees below the horizon is nautical twilight. One can still see the horizon at sea; that is, tell when the sea stops and the sky starts. From twelve to eighteen degrees is astronomical twilight, which is when the stars start to come out. After the Sun is more than eighteen degrees below the horizon, it's officially Night.
What is the meaning of Twilight?
Twilight is when the sun is below the horizon- either has not yet risen, or has just set. Civil twilight- what most people mean when they say twilight- the sun is no more than 6 degrees below the horizon. There is also nautical twilight, where the sun can be as much as 12 degrees below the horizon. That time is used by sailors to take "sightings" on stars with a sextant for navigation. In Nautical twilight, you can see stars, but there is still a visible horizon to use in your sightings.
What is the meaning of 'Civil' Twilight?
Twilight is when the sun is below the horizon- either has not yet risen, or has just set. Civil twilight- what most people mean when they say twilight- the sun is no more than 6 degrees below the horizon. There is also nautical twilight, where the sun can be as much as 12 degrees below the horizon. That time is used by sailors to take "sightings" on stars with a sextant for navigation. In Nautical twilight, you can see stars, but there is still a visible horizon to use in your sightings.
What time is twilight?
Twilight is the time between dawn and sunrise, and the time between sunset and dusk. Sunlight scattered in the upper atmosphere illuminates the lower atmosphere, and the surface of the Earth is not completely lit or completely dark. The sun itself is not actually visible because it is below the horizon
Why is it still considered twilight when the sun is already 15 degrees below the horizon?
There is still light reflecting off the earth's atmosphere after sunset. Officially, twilight ends at 18 degrees below horizon, when it is completely dark, although at 15 degrees it is dark enough!
How dark is the sky when the sun is geometrically nine degrees below the horizon?
pretty dark. seriously: is there an empirical measure of darkness, or is this question unanswerable? Obviously this question is about "twilight". There are 3 technical definitions of twilight. The example in this question falls into the category of "nautical twilight" (Sun between 6 and 12 degrees below horizon). The sky should be bright enough for the sea horizon to be visible for navigation purposes. The actual brightness of the sky depends on weather conditions and the direction of observation.
Does the sky get darker than astronomical twilight on dates near the June solstice in Munich Germany disregarding light pollution?
Astronomical twilight ends with the Sun's centre at 18 degrees below the horizon. Near the June solstice that happens at midnight at a latitude of 66.5-18 degrees which is 48.5 degrees. Munich has a latitude of 48.1 degrees so the answer is yes, but not very.
Why do you have to be within 48.5 degrees of the equator to get dark skies - without twilight - all year round?
The definition of "astronomical twilight" is when the Sun is more than 18 degrees below the horizon. At latitudes above 48.5 degrees, the Sun is less than 18 degrees below the horizon, even looking straight north (or south, for the southern hemisphere) at midnight on the solstice.
What is the cutoff - southernmost - latitude for astronomical dusk - start of twilight - near the summer solstice?
At the summer solstice the sun sets on the northern horizon at latitude 66.6 degrees north. At the same time astronomical twilight ends only at latitudes below 48.6 degrees north. It's 66.6 minus 18 because for astronomical twilight to end the Sun's centre must be 18 degrees below the horizon.
