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The Hertzsprung–Russell diagram (abbreviated as H–R diagram, HR diagram or HRD) is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities and their stellar classifications or effective temperatures. The diagram was created independently in 1911 by Ejnar Hertzsprung and by Henry Norris Russell ...
The unqualified term instability strip usually refers to a region of the Hertzsprung–Russell diagram largely occupied by several related classes of pulsating variable stars: Delta Scuti variables, SX Phoenicis variables, and rapidly oscillating Ap stars (roAps) near the main sequence; RR Lyrae variables where it intersects the horizontal branch; and the Cepheid variables where it crosses the ...
Military branch. A United States Armed Forces Joint-Service Color Guard. This color guard consists of personnel from 5 of the 6 military branches of the United States Armed Forces ( Army, Marines, Air Force, Navy, and Coast Guard ). Military branch (also service branch or armed service) is according to common standard a subdivision of the ...
Understand the moon phases and you can wager a pretty good guess about when the next full moon is no matter where we are in the lunar cycle. Here's how. The Moon Phases Explained, From the New ...
NATO Joint Military Symbology is the NATO standard for military map symbols. Originally published in 1986 as Allied Procedural Publication 6 ( APP-6 ), NATO Military Symbols for Land Based Systems, the standard has evolved over the years and is currently in its fifth version (APP-6D). The symbols are designed to enhance NATO 's joint ...
Horizontal branch. The horizontal branch ( HB) is a stage of stellar evolution that immediately follows the red-giant branch in stars whose masses are similar to the Sun 's. Horizontal-branch stars are powered by helium fusion in the core (via the triple-alpha process) and by hydrogen fusion (via the CNO cycle) in a shell surrounding the core.
Military organization ( AE) or military organisation ( BE) is the structuring of the armed forces of a state so as to offer such military capability as a national defense policy may require. Formal military organization tends to use hierarchical forms (see Modern hierarchy for terminology and approximate troop strength per hierarchical unit).
Outline of the Moon. The following outline is provided as an overview of and topical guide to the Moon: Moon – Earth 's only permanent natural satellite. It is one of the largest natural satellites in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits (its primary ). It is the second ...