Norton's Star Atlas and Reference Handbook (epoch 1950.0).Gall & Inglis, 1973 - 116 pagine |
Dall'interno del libro
Risultati 1-3 di 21
Pagina 25
... apertures the following figures apply : Aperture 15 cm ( 6 in . ) 20-25 cm ( 8-10 in . ) 30-40 cm ( 12-16 in . ) EFR 25-60 60 80 Example : For a chosen EFR the focal length of the eyepiece can be found . Let D = 6 in . , focal ratio = f ...
... apertures the following figures apply : Aperture 15 cm ( 6 in . ) 20-25 cm ( 8-10 in . ) 30-40 cm ( 12-16 in . ) EFR 25-60 60 80 Example : For a chosen EFR the focal length of the eyepiece can be found . Let D = 6 in . , focal ratio = f ...
Pagina 108
... aperture - i.e . the clear diameter of the large lens in a refracting telescope , and of the main mirror in a reflector . The larger the aperture , the greater the ' light - gathering power ' of the telescope , and hence the greater its ...
... aperture - i.e . the clear diameter of the large lens in a refracting telescope , and of the main mirror in a reflector . The larger the aperture , the greater the ' light - gathering power ' of the telescope , and hence the greater its ...
Pagina 110
... aperture will be found appropriate ; thus for a 7.5 cm telescope a suitable power will be × 25 to 30 , for a 10 cm aperture 30 to x 40 , etc. ( ii ) One of moderate power , say × 10 to × 12 per cm of aperture ( × 75 to × 100 for a 7.5 cm ...
... aperture will be found appropriate ; thus for a 7.5 cm telescope a suitable power will be × 25 to 30 , for a 10 cm aperture 30 to x 40 , etc. ( ii ) One of moderate power , say × 10 to × 12 per cm of aperture ( × 75 to × 100 for a 7.5 cm ...
Sommario
Useful Tables | 31 |
The Solar System | 41 |
Stars Nebula and Galaxies | 83 |
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Norton's Star Atlas and Reference Handbook (epoch 1950.0). Arthur Philip Norton,Christopher R. Kitchin Visualizzazione estratti - 1973 |
Norton's Star Atlas and Reference Handbook (epoch 1950.0). Arthur Philip Norton,Christopher R. Kitchin Anteprima non disponibile - 1973 |
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altitude angle aperture apparent apparent magnitude Astronomical atmosphere axis bright brighter Cassiopeia Catalogue celestial equator celestial sphere Centauri centre Cepheid co-ordinates colour comet constellation Corona craters Cygni Declination diameter disk distance Earth ecliptic epoch equatorial Equinox eyepiece focal length Galactic galaxy globular hemisphere horizon hour circle inferior planets Jupiter latitude light Little change longitude luminosity lunar Lyræ magnitude Main Sequence Mare Mars mean meridian minor planets Mira type Mira type Mira Moon Nebula Nova novæ observed open cluster orbit Orionis parallax parsecs planetary polar pole position proper motion R.A. Dec radiation Relatively fixed Right Ascension rotation period Sagittarii satellites Saturn seconds of arc seen sidereal Slow binary solar spectral Spectral Classification spectral type spectrum stellar Sun's sunspot surface TABLE telescope temperature transits type Mira type Ursa Majoris Variable Stars velocity Venus Virginis visible wavelength ΟΣ