F-16 vs F-15 dogfight

Dusk...to dawn...to dusk

From www.outdoor-photos.com

The picture above is labeled 'Dusk' by the photographer, but have you ever thought about all the official terms we have for the different times of day? I'm completely enthralled with the colors of the sky, regardless of the terms we use, but just for my future reference, if nothing else, here are some of those terms. Most information below was gleaned from a NOAA site.

[Astronomical dawn]
This is the time at which the sun is 18 degrees below the horizon in the morning. Astronomical dawn is that point in time at which the sun starts lightening the sky. Prior to this time, the sky is completely dark.

[Nautical dawn]
This is the time at which the sun is 12 degrees below the horizon in the morning. Nautical dawn is defined as that time at which there is just enough sunlight for objects to be distinguishable.

[Dawn or civil dawn]
This is the time at which the sun is 6 degrees below the horizon in the morning. Civil dawn is defined as that time at which there is enough light for objects to be distinguishable and that outdoor activities can commence.

[Twilight]
The time between civil dawn and sunrise.

[Sunrise]
The time at which the first part of the sun appears above the horizon in the morning.

[Solar noon]
This is the time at which the sun is the highest in the sky. This time varies through the year due to the change in speed of the earth's orbit around the sun.

[Sunset]
The time the last part of the sun disappears below the horizon in the evening.

[Twilight]
The time between sunset and civil dusk.

[Dusk or civil dusk]
This is the time at which the sun is 6 degrees below the horizon in the evening. At this time objects are distinguishable but there is no longer enough light to perform any outdoor activities.

[Nautical dusk]
This is the time at which the sun is 12 degrees below the horizon in the evening. At this time, objects are no longer distinguishable.

[Astronomical dusk]
This is the time at which the sun is 18 degrees below the horizon in the evening. At this time the sun no longer illuminates the sky.

Pilot Dies at Controls...Passenger Lands Plane

Unintentional King Air Pilot ~ AOPA article

The Office

http://www.airplane-pictures.net/image13302.html