Stamp: Edmond Halley (Tonga 1986)
Edmond Halley (Tonga 1986)
26 March (Tonga ) within release Halley's Comet goes into circulation Stamp Edmond Halley face value 42 Tongan shilling
| Stamp Edmond Halley in catalogues | |
|---|---|
| Michel: | Mi:TO 933 |
Stamp is square format.
Edmond Halley, FRS was an English astronomer, geophysicist, mathematician, meteorologist, and physicist who is best known for computing the orbit of Halley's Comet.Also in the issue Halley's Comet:
- Stamp - Halley's Comet face value 42;
- Stamp - Edmond Halley face value 42;
- Stamp - Planetary system face value 42;
- Stamp - Telescope face value 42;
- Stamp - Giotto, European Space Probe face value 42;
- Stamp - Halley's Comet face value 57;
- Stamp - Edmond Halley face value 57;
- Stamp - Planetary system face value 57;
- Stamp - Telescope face value 57;
- Stamp - Giotto, European Space Probe face value 57;
- Se-tenant - Halley's Comet face value 5*42;
- Se-tenant - Halley's Comet face value 5*57;
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Data entry completed
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| Stamp Edmond Halley in digits | |
| Country: | Tonga |
| Date: | 1986-03-26 |
| Print: | Offset lithography |
| Perforation: | 14 |
| Emission: | Commemorative |
| Format: | Stamp |
| Face Value: | 42 Tongan shilling |
Stamp Edmond Halley it reflects the thematic directions:
An astronomer is a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth. They observe astronomical objects such as stars, planets, moons, comets and galaxies – in either observational (by analyzing the data) or theoretical astronomy. Examples of topics or fields astronomers study include planetary science, solar astronomy, the origin or evolution of stars, or the formation of galaxies. A related but distinct subject is physical cosmology, which studies the Universe as a whole
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.
