Nature, Volume 108Sir Norman Lockyer Macmillan Journals Limited, 1921 |
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... star is known , we can calculate its transverse speed in kilometres a second from its proper motion in seconds of arc per century , and we can determine its absolute brightness from its apparent bright- ness . For binary stars at known ...
... star is known , we can calculate its transverse speed in kilometres a second from its proper motion in seconds of arc per century , and we can determine its absolute brightness from its apparent bright- ness . For binary stars at known ...
Página 125
... stars in its neighbourhood by means of a position micrometer as used for double stars , and by Henderson , who used meridian observations in both co - ordinates of a Centauri . During the next fifty years a number of ob- servers made ...
... stars in its neighbourhood by means of a position micrometer as used for double stars , and by Henderson , who used meridian observations in both co - ordinates of a Centauri . During the next fifty years a number of ob- servers made ...
Página 126
... stars , while as late as 1915 the number had risen only to about 200 . As one of the recent large publications we may instance the 260 determinations made at the McCormick Observatory in the five years 1914 to 1919.1 Let us consider the ...
... stars , while as late as 1915 the number had risen only to about 200 . As one of the recent large publications we may instance the 260 determinations made at the McCormick Observatory in the five years 1914 to 1919.1 Let us consider the ...
Índice
Cusack Dr J The Arithmetic of the Decimal System 174 Doyle K D Agriculture and Irrigation in Continental | 7 |
BarrettHamilton and M A C Hinton Part | 21 |
Grandidier A obituary 286 Hamilton G H Observations of Mars at Flagstaff 447 | 32 |
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