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vrimë

The size of the primary optical surface of an astronomical instrument (telescope), usually given in inches, centimeters, or meters. In the case of a reflecting telescope, the aperture usually refers to the size of the main mirror; in the case of a refracting telescope (of which binoculars are one example), the aperture refers to the size of the primary lens (which in binoculars is usually given in millimeters).

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vrimë e zezë
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Is a sharp seasonal decrease in stratospheric ozone concentration that occurs over Antarctica in the spring. First detected in the late 1970s, the ozone hole continues to appear ...

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hole drill in the skull to facilitate the implant of dbs lead

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vit julian
علم الفلك; فلك عام

Exactly 365. 25 days, in which a century (100 years) is exactly 36525 days and in which 1900. 0 corresponds exactly to 1900 January 0. 5 (from the Julian-date system, which is ...

heliocentrik
علم الفلك; فلك عام

Referring to the sun. A heliocentric orbit is one based on the sun as one of the two foci of the (elliptical) orbit (or as the center of a circular orbit); a heliocentric ...

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علم الفلك; فلك عام

The interval of time in days (and fraction of a day) since Greenwich noon on Jan. 1, 4713 BC. The JD is always half a day off from Universal Time, because the current definition ...

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علم الفلك; فلك عام

Either of the two points (vernal, autumnal) on the celestial sphere where the ecliptic (which is the apparent path of the sun on the sky) intersects the celestial equator. Due to ...

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علم الفلك; فلك عام

Angular distance of a celestial object from the sun in the sky. In standard ephemerides, this is usually denoted by the Greek letter epsilon (or by the abbreviation "Elong. "). A ...

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علم الفلك; فلك عام

One element of the astronomical coordinate system on the sky that is used by astronomers. Declination, which can be thought of as latitude on the earth projected onto the sky, is ...

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