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Date
Country
SG no(s)
Subject
1951
France
1138
Pic du Midi Observatory
1951
Poland
709
Nicolaus Copernicus
1951
USSR
1715
Konstantin Tsiolkovsky
1952
Japan
649, 650
Southern Cross;
the Plough
1952
Peru
788
Inca Observatory
1953
Austria
1247
Johannes Kepler
1953
China (PR)
1604
Armillary sphere
1953
China (PR)
1608
Nicolaus Copernicus
1953
Ecuador
985
Equatorial line monument
1953
Japan
718
Tokyo Observatory
1953
Poland
812, 813
Nicolaus Copernicus
1953
Somalia
275–277
Aeroplane and constellations
1954
Canada
474
Plough and gannet
1954
USSR
1856
Pulkovo Observatory
1955
China (PR)
1660–1662
Zhang Heng, Zu Chongzhi,
Zhang Sui
1955
France
1257
Laplace
1955
Germany
1130
C. F. Gauss
1955
Poland
912
Copernicus monument
1955
USSR
1888
Nicolaus Copernicus
1955
USSR
1926
Observing aurora
1956
France
1282
Camille Flammarion
1956
Germany (East)
E262
Dresden Observatory
1956
Iran
1086–1088
al-Tusi (Nasireddin)
1956
Israel
127
Albert Einstein
1956
Italy
939
International Astronautical Congress
1956
Korea (South)
249
Kyongju Observatory
1956
USSR
2028
F. A. Bredikhin
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