Circle of illumination

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Circle of illumination of April

The circle of illumination that I looked at from the International Space Station. The circle of illumination becomes dim, but this part is a state of the dim light.

The circle of illumination every season. I become honest for the earth in the spring equinox, the autumnal equinox.

Circle of illumination (めいあんきょうかいせん, Terminator) is the line in a daytime side and the interval by the dark night getting the light in a planet. I am defined as a trace of the points of intersection with the tangent line from the sun. Half places becoming bright change by the rotation of planet in itself and the revolution around the fixed star by time during one day. In addition, I have a big influence on the circle of illumination in a season.

In the frame of reference of the rotating planet, circle of illumination is a point of the sunrise and a point of the sunset.

I can obtain information about the surface state of the planet by checking circle of illumination. For example, it means atmospheric existence if a line becomes dim.

Table of contents

Circle of illumination of the earth

On the summer solstice and a day of the winter solstice, the circle of illumination takes the special point of view that inclined 23.5 degrees from the axis.

The amateur radio communications lover receives a benefit by a state of the circle of illumination. This is because the radio wave pushes forward long distance from a point on the circle of illumination to the contralateral edge along it.

Concorde and Tu-144 are the airplanes which can fly faster than movement of the circle of illumination unless they go along the neighborhood of pole. Concorde which took off from Heathrow or Paris in a certain evening can arrive at the destination before the sunset. From a cockpit, I can see the sun to climb from the west then.

References

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Allied item

• At night

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