Learn about sunrise and sunset

Dawn and sunset are two moments of silence but also beautiful in a day. In fact, not everyone understands this concept and what is the difference between them? The following article will give you the most simple and understandable concepts about sunrise and sunset, invite you to watch.

What is dawn?

Good dawn (dawn) happens before the sun rises. It is noted in the presence of weak rays of the Sun, while the Sun is still under the horizon.

Sunrise at Cua Lo, Vietnam.

Classify

1. Astronomical dawn : It is the period of time calculated from the moment that the sky is no longer completely dark, officially defined as from the time when the Sun is at 18 degrees below the horizon of the horizon. morning until the Sun rises. It closely coincides with the US concept of the castronomical dawn.
2. Dawn of the Sea : It is the period of time calculated from the moment that since then there has been enough light from the Sun on the horizon and some objects can be distinguished, officially defined as from time to time. the point where the Sun is at 12 degrees below the horizon of the morning until the Sun rises. It coincides with the concept of nautical dawn of the United States.
3. Densely populated : It is the period of time calculated from the time when there is enough light from the Sun to distinguish some objects and some outdoor activities can start without Artificial light, which is officially defined as from the time when the Sun is at 6 degrees below the horizon of the morning until the Sun rises. It is similar to the concept of civil dawn of the United States.

Ranging should not be confused with the time when the Sun rises, when the upper edge of the Sun appears above the horizon.

What is sunset?

A sunset.

The sunset, also known as sunset, dusk, twilight, dusk, darkness of the human face . are phrases that refer to a period of time right after the Sun sets until it is completely dark. (night). It is the concept associated with the apparent position of the Sun below the horizon.

Classify

1. Astronomical sunset is the time when the Sun is between 12 and 18 degrees below the horizon in the evening-evening. At this time, the Sun no longer illuminated the sky and thus could not interfere with astronomical observations.
2. Maritime sunset is the time when the Sun is between 6 and 12 degrees below the horizon in the evening-evening. At this time, objects can no longer be distinguished, the horizon is no longer visible to the naked eye.
3. Civilian sunset is the time when the Sun is between 0 and 6 degrees below the horizon in the evening-evening. At this time objects could be distinguished, and some stars (stars and certain planets of the solar system) appeared in the sky, visible to the naked eye when it was clear. .

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