Se-tenant: Total Eclipse of the Sun, 11 July 1991 (El Salvador 1991)
Total Eclipse of the Sun, 11 July 1991 (El Salvador 1991)
17 December (El Salvador ) within release Total Eclipse of the Sun goes into circulation Se-tenant Total Eclipse of the Sun, 11 July 1991 face value 2*70 Salvadoran centavo
| Se-tenant Total Eclipse of the Sun, 11 July 1991 in catalogues | |
|---|---|
| Michel: | Mi: SV 1862-1863 |
| Yvert et Tellier: | Yt: SV 1119-1120 |
| Stanley Gibbons: | Sg: SV 2179a |
Se-tenant is square format.
Also in the issue Total Eclipse of the Sun:
- Stamp - Left face value 70;
- Stamp - Right face value 70;
- Se-tenant - Total Eclipse of the Sun, 11 July 1991 face value 2*70;
Se-tenant Total Eclipse of the Sun, 11 July 1991 it reflects the thematic directions:
Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics, physics, and chemistry in order to explain their origin and their overall evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, meteoroids, asteroids, and comets. Relevant phenomena include supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation. More generally, astronomy studies everything that originates beyond Earth's atmosphere. Cosmology is a branch of astronomy that studies the universe as a whole. .
The Sun, also known as Sol, is a star at the center of the solar system. It is a white star that gives off different types of energy such as infrared energy (heat), ultraviolet light, radio waves and light. It also gives off a stream of particles, which reaches Earth as "solar wind". The source of all this energy is nuclear fusion. Nuclear fusion is the reaction in the star which turns hydrogen into helium and makes huge amounts of energy. It is a nearly perfect ball of hot plasma.
