Word: musterung
(lookup in dictionary)
(lookup stats)
Dates: during 1901-1901
Sort By: most recent first
(reverse)
...facilitate the work with bright variables, which may be investigated with the naked eye or with only a small glass, photographic enlargements have been made of portions of the Bonn Durch-musterung charts. A region three degrees square, surrounding each variable, has been three times enlarged, giving a map on the standard scale of one minute of arc to the millimetre. On these enlargements the designations of the stars in sequence have been marked. Copies will be furnished to observers at cost, or free of expense to persons of experience who are ready to co-operate in the work. Complete...
| 1 |