The 11th in our new challenge layout catering for all aspects of nature for us nature lovers.
For this challenge please add your images of SUNRISES & SUNSETS.
> Sunrise is the instant at which the upper edge of the Sun appears above the horizon in the east. Sunrise should not be confused with dawn, which is the (variously defined) point at which the sky begins to lighten, some time before the sun itself appears, ending twilight. Because atmospheric refraction causes the sun to be seen while it is still below the horizon, both sunrise and sunset are, from one point of view, optical illusions. The sun also exhibits an optical illusion at sunrise similar to the moon illusion.
> The apparent westward revolution of Sun around the earth after rising out of the horizon is due to the Earth’s eastward rotation, a counter-clockwise revolution when viewed from above the North Pole. This illusion is so convincing that most cultures had mythologies and religions built around the geocentric model. This same effect can be seen with near-polar satellites as well.
> Sunset or sundown is the daily disappearance of the Sun below the horizon in the west as a result of Earth’s rotation.
The time of sunset is defined in astronomy as the moment the trailing edge of the Sun’s disk disappears below the horizon in the west. The ray path of light from the setting Sun is highly distorted near the horizon because of atmospheric refraction, making sunset appear to occur when the Sun’s disk is already about one diameter below the horizon. Sunset is distinct from dusk, which is the moment at which darkness falls, which occurs when the Sun is approximately eighteen degrees below the horizon. The period between sunset and dusk is called twilight.
> Locations north of the Arctic Circle and south of the Antarctic Circle experience no sunset or sunrise at least one day of the year, when the polar day or the polar night persist continuously for 24 hours.
> Sunset creates unique atmospheric conditions such as the often intense orange and red colors of the Sun and the surrounding sky.
Vote for your favourite.
1st place winners will get to choose the theme for the next challenge, have their photo used as the group Avatar for a period of time and become a featured member.
Then 1st, 2nd and 3rd will have their photo’s posted on the groups Feature Board.
ENTRIES MUST BE ADDED TO THE GROUP FIRST OR BE DELETED FROM THE CHALLENGE.
NO HUMANS, HUMAN MADE OBJECTS, PETS, DOMESTIC LIVESTOCK