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midsummer day and midsummer night

(Encyclopedia)midsummer day and midsummer night, names given to the feast of the nativity of St. John the Baptist (June 24) and the preceding night (St. John's Eve, June 23). Because midsummer is about the time of ...

De la Rue, Warren

(Encyclopedia)De la Rue, Warren dĕlˈəro͞o, dĕləro͞oˈ [key], 1815–89, British scientist and inventor. Especially noted as an astronomer, he was a pioneer in celestial photography. He adapted the wet-plate ...

chromosphere

(Encyclopedia)chromosphere krōˈməsfērˌ [key] [Gr.,=color sphere], layer of rarefied, transparent gases in the solar atmosphere; it measures 6,000 mi (9,700 km) in thickness and lies between the photosphere (th...

Borschberg, André

(Encyclopedia)Borschberg, André, 1952–, Swiss engineer, businessman, and pilot. With Bertrand Piccard (see under Piccard, Auguste) he founded Solar Impulse to develop a solar-powered plane capable of circumnavig...

Major Planets of the Solar System (table)

(Encyclopedia)Major Planets of the Solar System ...

calendar

(Encyclopedia)calendar [Lat., from Kalends], system of reckoning time for the practical purpose of recording past events and calculating dates for future plans. The calendar is based on noting ordinary and easily o...

dwarf planet

(Encyclopedia)dwarf planet, a nonluminous body of rock or gas that orbits the sun and has a rounded shape due to its gravity. Unlike a planet, a dwarf planet is not capable of clearing its orbit of smaller objects ...

Dyson, Sir Frank Watson

(Encyclopedia)Dyson, Sir Frank Watson dīˈsən [key], 1868–1939, English astronomer, b. Ashby-de-la-Zouch, grad. Cambridge. He was astronomer royal of Scotland (1905–10) and of England (from 1910). As director...

Harvard College Observatory

(Encyclopedia)Harvard College Observatory, astronomical observatory located in Cambridge, Mass., operated by Harvard (Harvard College at the time of the observatory's founding in 1839). Its equipment includes a 61-...

Pegasus, in astronomy

(Encyclopedia)Pegasus pĕgˈəsəs [key], in astronomy, northern constellation lying SW of Andromeda and SE of Cygnus. It is named for the mythological winged horse Pegasus. The constellation is easily recognized b...