Jellied Eel Posts: 33, Forum Member. And today, I learned that Brian May knows more about guitars and this phenomena than me. Someone suggested to me that it is probably about the same amount of time after sunset before it gets totally dark, but I don't believe them. Here you go In towns and cities, street lighting and pollution or clouds generally hide nautical and astronomical twilight from view.
There's definitely no sign of "daylight trying to creep through" here in my part of S England 'just after 3" but I suppose with a clear view of the horizon, maybe?
TeeGee Posts: 5, Forum Member. In Cheshire it is just starting to rain at 5. So dark you can barely see a hand in front of your face! The astronomical designation are fine in theory but in practice It depends where you are. Sunset and sunrise have exactly the same definition: the time when the apparent uppermost ray of the Sun is on the astronomical horizon.
If it is the first ray, it is sunrise and if it is the last ray, it is sunset. For a viewer on Earth, where the ocean seems to touch the sky defines the horizon. Due to continuous refraction of light rays at each layer, it follows a curved path and reaches the eye of the observer. As a result , we can see the sun 2 mins. It occurs the moment the disc of sun completely disappears below the western horizon.
Sun as in the sun, and the rise is to elevate from a position, therefore sunrise is when the sun seems to elevate into a position above from where it seemed.
Dusk and dawn are considered as the most important hours of the 24 hours of the day because this is when one can open portals or dimensions to other worlds physical or spiritual. Dawn sets around in the morning. Daybreak, also called dawn or the glow of dawn, begins with the first appearance of light about a half hour before the sun comes up.
Sunrise is the instant when the top of the sun just appears on the sea-level horizon. The whole interval of time between daybreak and sunrise is known as morning twilight or morning dusk. Add Image Optional Drag a photo here — or — Browse for image. Cancel Submit Answer. Don't have an account? Join now. More Science Questions How are plants able to sprout out of concrete?
Your current location and time zone have likely already been detected. The color diagram gives a rough depiction of how the color temperature of sunlight transitions between each of the marked times, presuming clear skies. Depiction of light as the day progresses from midday to dusk or reverses towards dawn. For locations near the poles, the above representation may no longer be representative.
Note how the contrast, direction and color temperature changes the appearance of the sphere as the day progresses. For more on types of light, also refer to the tutorial on natural light in photography. What we really see during sunrise and sunset is the sun's apparent position — not its actual position.
The apparent position is determined by how the sun's image gets refracted as viewed through the atmosphere, similar to how objects underwater appear shifted relative to their actual position.
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