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The period between sunset and dusk is called twilight. Astronomers recognize three stages of twilight. Civil twilight begins when the sun's disc is 6 degrees below the horizon . Other celestial objects are still clearly visible at this point. Then Nauitical twilight until the sun sank below the horizon 12 degrees. In this period the horizon looks unclear. astronomical twilight-total dark-started when the Sun is 18 degrees below horizon. The same thing happened - in reverse order, when the sun will rise.

The position of the Sun in the Determination of Salat Time ,

"True prayer is an obligation that is determined his time upon those who believe "(QS An-Nisa: 103).

Of the provisions contained in the Qur'an and Hadith to be understood that the provisions of prayer is associated with the position of the sun on the celestial sphere. Therefore, in determining the initial prayers, astronomical data is the most important positions of the sun, especially high, h, or zenith distance. The phenomenon of early dawn (morning twislight), sunrise (sunrise), the sun crossed the meridian (culmination), sunset (sunset), and late afternoon (evening twilight) associated with the sun's zenith distance.

Isha dan Shubuh

Isha time is defined as when red light (syafaq) in the sky are gone, until dawn shaddiq. While Shubuh time begins when the dawn shaddiq appear, until shortly before sunrise (syuruq). Please note, that shortly after sunset, the sky not directly darkened, because our planet has an atmosphere so that even though the sun is below the horizon (the west), there is still the reflected sunlight in the sky.

From the astronomical side, there is light in the sky before sunrise and after sunset is called Twilight, which literally means "light between two", ie between day and night. In Arabic, "twilight" is called syafaq. Astronomically, there are three definitions of twilight:

Civil Twilight, when the sun is 6 ° below the horizon
Nautical twilight, ie when the sun is 12 ° below the horizon
Astronomical Twilight, when the sun is 18 ° below the horizon

Astronomers think "Twilight Astronomical evening" marks the beginning of the night; but this definition is for practical purposes only.

Astronomically, the time is the inverse of the time Shubuh and Isha '. Toward morning, dawn marked by a towering light (vertical) on the eastern horizon; This is called "dawn kadzib". The light is then spread on the horizon (horizontally), and is called the "dawn shaddiq".

Allah Know The Best