The moment of the onset of the orb on the horizon as a result of the virtual daily movement in the sky. The cause of refraction at the horizon of up to about 35 'in the appearance of a bright star if the presence below the horizon by that value. Therefore, it is necessary to distinguish between each of the virtual and the real sunrise sunrise. The same applies to the disappearance of a celestial body below the horizon.
Sometimes a distinction is made between Chroqat and sunsets special star. This is the sunrise cosmic, in which the star shine with the sun; and sunset cosmic, which Wester star with sunrise; then sunrise real Alavola, in which the star time of sunset shines the sun; and sunset real Alavola, which Wester star with the sunset. These phenomena can not be seen with the naked eye while can see both sunrise Ctraca, in which the star seen during Chrogah in the morning twilight; and sunset Ctraca, which sees the star for the last time a Wester in evening twilight. There is also a virtual Alavola sunrise, which sees the star for the last time, which shines in the evening twilight, then the virtual cosmic sunset, a sunset scenes for the first time to star in the twilight during the morning.
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