Description:
Obverse
On the obverse above there are the Small Coat of Arms of Ukraine, the coin issue year indication 2009 and the legend in three lines: НАЦІОНАЛЬНИЙ БАНК УКРАЇНИ (National Bank of Ukraine) thereunder; lower - a conventional design of Solar System in which the third from the Sun planet, i.e. Earth, is made of a blue topaz of 0.2 carat; against the background of orbits there is an armillary sphere, a classical astronomical instrument, that was used to determine the coordinates of celestial bodies, and the two-line inscription 100 ГРИВЕНЬ (100 hryvnias) thereunder.
Reverse
On the reverse against the raised background there are depicted: on the left - Galileo Galilei (above) and a conventionalized medieval miniature of starry sky observation (below); on the right - one of galaxies (above) and a radio telescope (below). Against the smooth background of the coin there are: the image of an observatory (below) and the inscriptions above: the bow-shaped МІЖНАРОДНИЙ (International), РІК (year) and (in the centre of the composition) АСТРОНОМІЇ (of astronomy), in which the Saturn image substitutes for the O letter.
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