Astronomy is a natural science that studies celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, and comets. Relevant phenomena include supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave…
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Themes: House of Habsburg
The House of Habsburg was one of the most prominent royal houses of Europe in the 2nd millennium. The house takes its name from Habsburg Castle, a fortress built in the 1020s in present-day Switzerland by Radbot of Klettgau, who named his fortress Habsburg. His grandson Otto II was the…
View More Themes: House of HabsburgThematic: Astrology – Chinese Zodiac
The Chinese zodiac is a classification scheme based on the lunar calendar that assigns an animal and its reputed attributes to each year in a repeating 12-year cycle. The 12-year cycle is an approximation to the 11.85-year orbital period of Jupiter. Originating from China, the zodiac and its variations remain…
View More Thematic: Astrology – Chinese ZodiacThematic: Astrology
Astrology is a pseudoscience that claims to divine information about human affairs and terrestrial events by studying the movements and relative positions of celestial objects. Astrology has been dated to at least the 2nd millennium BCE, and has its roots in calendrical systems used to predict seasonal shifts and to…
View More Thematic: AstrologyThematic: Astrology – Zodiac
The zodiac is an area of the sky that extends approximately 8° north or south (as measured in celestial latitude) of the ecliptic, the apparent path of the Sun across the celestial sphere over the course of the year. The paths of the Moon and visible planets are also within…
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Letter Box
A letter box, letterbox, letter plate, letter hole, mail slot or mailbox is a receptacle for receiving incoming mail at a private residence or business. For the opposite purpose of collecting outgoing mail, a post box is generally used instead. Letterboxes or mailboxes use the following primary designs: A slot…
View More Letter BoxUNESCO
The United Nations Educational, Scientific and Cultural Organization is a specialised agency of the United Nations (UN) aimed at promoting world peace and security through international cooperation in education, the sciences, and culture. It has 193 member states and 11 associate members, as well as partners in the nongovernmental, intergovernmental,…
View More UNESCOThematic: Hippology
Hippology is the study of the horse. Blogs Horse Stamps Horses on Stamps Facebook Horse on Stamps
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Thematic: Geography
Geography is a field of science devoted to the study of the lands, features, inhabitants, and phenomena of the Earth and planets. Geography is an all-encompassing discipline that seeks an understanding of Earth and its human and natural complexities—not merely where objects are, but also how they have changed…
View More Thematic: GeographyThematic: Cruise Ships
Cruise ships are large passenger ships used mainly for vacationing. Unlike ocean liners, which are used for transport, they typically embark on round-trip voyages to various ports-of-call, where passengers may go on tours known as “shore excursions”. On “cruises to nowhere” or “nowhere voyages”, cruise ships make two- to three-night…
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