Popular Astronomy, Volume 50Goodsell Observatory of Carleton College, 1942 |
From inside the book
Results 1-3 of 31
Page 185
... sun- spot maxima and sunspot minima is of the order of from 50-60 percent . Appleton points out that this variation necessitates a corresponding . energy change in the extreme ultra - violet of the solar spectrum of from 120-150 percent ...
... sun- spot maxima and sunspot minima is of the order of from 50-60 percent . Appleton points out that this variation necessitates a corresponding . energy change in the extreme ultra - violet of the solar spectrum of from 120-150 percent ...
Page 491
... Sunspot Numbers By WALTER G. BOWERMAN The following summary which I have noted in regard to the monthly sunspot numbers covering the years 1749 to 1939 , a period of 191 years , may be of interest . In 1810 there were none ; so that ...
... Sunspot Numbers By WALTER G. BOWERMAN The following summary which I have noted in regard to the monthly sunspot numbers covering the years 1749 to 1939 , a period of 191 years , may be of interest . In 1810 there were none ; so that ...
Page 519
total sunspot areas of the peaks of cycles is shown in the following table , in which areas are expressed in millionths of the sun's visible hemisphere : Year 1836 1847 1859 1870 1883 Area 1331 .1021 .1404 .2761 .... 1155 Year 1893 1905 ...
total sunspot areas of the peaks of cycles is shown in the following table , in which areas are expressed in millionths of the sun's visible hemisphere : Year 1836 1847 1859 1870 1883 Area 1331 .1021 .1404 .2761 .... 1155 Year 1893 1905 ...
Contents
Bolide observed A bright 451 | 114 |
STELLAR DISTANCES FREDERICK SLOCUM | 117 |
METEORITIC FOSSILS BEN HUR WILSON | 125 |
33 other sections not shown
Other editions - View all
Common terms and phrases
absolute magnitude American American Astronomical Society American Meteor Society angle appeared Astronomical Society atmosphere average azimuth changes College comets constellation craters Cygni diameter direction distance earth eclipse end point ephemeris errors fireball galactic galaxies given height horizon indicated instruments July June Jupiter latitude Lick Observatory light curve longitude luminosity lunar Mare Imbrium Mars maxima maximum mean measured meridian meteor meteorite method miles minimum moon motion nebulae Notes novae object observations Observatory obtained OCCULTATIONS Ohio orbit paper parallax path perihelion phenomena photographs planet POPULAR ASTRONOMY position predicted present probably problem projectile radiation region reports rotation seen solar spectra spectral type spectrum SS Cygni stellar sunspot surface Table telescope tion train University Variable Star variation velocity Venus visible Yerkes Observatory zenith Zodiacal Light