Stamp: Arthurian magician, Merlin, sights comet, 530. (Sierra Leone 1986)
Arthurian magician, Merlin, sights comet, 530. (Sierra Leone 1986)
01 April (Sierra Leone ) within release Appearance of Halley's Comet goes into circulation Stamp Arthurian magician, Merlin, sights comet, 530. face value 10 Sierra Leonean leone
| Stamp Arthurian magician, Merlin, sights comet, 530. in catalogues | |
|---|---|
| Michel: | Mi: SL 886 |
| Stamp Number: | Sn: SL 758 |
Stamp is square format.
Also in the issue Appearance of Halley's Comet:
- Stamp - Johannes Kepler (1571-1630) and Paris Observatory face value 15;
- Stamp - Bayeux Tapestry (detail), 1066 sighting. face value 70;
- Stamp - Arthurian magician, Merlin, sights comet, 530. face value 10;
- Stamp - US space shuttle landing, 1985. face value 50;
- Souvenir Sheet - Comet over Sierra Leone. face value 12;
- Stamp - Comet over Sierra Leone face value 12;
Stamp Arthurian magician, Merlin, sights comet, 530. it reflects the thematic directions:
A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing. This produces an extended, gravitationally unbound atmosphere or coma surrounding the nucleus, and sometimes a tail of gas and dust gas blown out from the coma. These phenomena are due to the effects of solar radiation and the outstreaming solar wind plasma acting upon the nucleus of the comet. Comet nuclei range from a few hundred meters to tens of kilometers across and are composed of loose collections of ice, dust, and small rocky particles. The coma may be up to 15 times Earth's diameter, while the tail may stretch beyond one astronomical unit. If sufficiently close and bright, a comet may be seen from Earth without the aid of a telescope and can subtend an arc of up to 30° (60 Moons) across the sky. Comets have been observed and recorded since ancient times by many cultures and religions.
