Stamp: Dakar, Senegal (Alderney 2017)
Dakar, Senegal (Alderney 2017)
19 July (Alderney ) within release Coastal eclipses goes into circulation Stamp Dakar, Senegal face value 73 Guernsey penny
| Stamp Dakar, Senegal in catalogues | |
|---|---|
| Michel: | Mi: GG-AL 588 |
| Yvert et Tellier: | Yt: GG-AL 589 |
| Unificato: | Un: GG-AL 589 |
Stamp is square format.
Also in the issue Coastal eclipses:
- Stamp - Hamilton, Bermuda face value 60;
- Stamp - Vancouver, Canada face value 44;
- Stamp - Saint Anne, Alderney face value 80;
- Souvenir Sheet - Coastal eclipses face value 406;
- Stamp - Miami, USA face value 59;
- Stamp - Dakar, Senegal face value 73;
- Stamp - Anadyr, Russia face value 90;
Stamp Dakar, Senegal 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 Moon is Earth's only natural satellite. It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Tidal forces between Earth and the Moon have over time synchronized the Moon's orbital period (lunar month) with its rotation period (lunar day) at 29.5 Earth days, causing the same side of the Moon to always face Earth. The Moon's gravitational pull – and to a lesser extent, the Sun's – are the main drivers of Earth's tides.
