Chart of the rising and setting times of the Sun, Moon and planets. Create your own charts of the positions and sizes of astronomical bodies. 3D view of the day and night sides on the Earth. World map showing where it is presently daytime, night time, or twilight. Live map of where satellites currently are, and where they appear in the night sky.

Hertzsprung-Russell diagram, in astronomy, graph in which the absolute magnitudes (intrinsic brightness) of stars are plotted against their spectral types (temperatures). Of great importance to theories of stellar evolution, it evolved from charts begun in 1911 by the Danish astronomer Ejnar Hertzsprung and independently by the U.S. astronomer ...

An online planetarium from In-The-Sky.org, showing what stars and planets you'll be able to see in the night sky on any given day of the year. In-The-Sky.org Guides to the night sky

2011年7月1日 · A key to this success is a graph that two astronomers introduced 100 years ago. The Hertzsprung-Russell (H-R) diagram is simple. It plots two basic properties of stars: their luminosity...

The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science.

2 天之前 · It shows a realistic star map, just like what you see with the naked eye, binoculars or a telescope.

This diagram is in equatorial coordinates, i.e. Right Ascension and Declination. The (red line) is the celestial equator. In the course of the year, the Sun spends six months above the celestial equator (~21st March to ~20th September) and six months below (~20th September to …

2020年4月14日 · With their unique and slightly mysterious look, star charts attempt to capture what we see and what we know about the night sky. Styles have evolved over time, from elaborate decorated maps of...

1 天前 · Though not exceedingly rare, they’re worth observing since they don’t happen every year. ... “Planet parade” isn’t a technical term in astronomy, and “planetary alignment” can refer to several different phenomena. As the planets of our solar system orbit the Sun, they occasionally line up in space in events called oppositions and ...

Determine the age of a protostar using an H–R diagram and the protostar’s luminosity and temperature; Explain the interplay between gravity and pressure, and how the contracting protostar changes its position in the H–R diagram as a result