 | sir John Frederick W. Herschel (1st bart.) - 1833 - 500 pagine
...months, till it becomes completely invisible, in which state it remains during about five months, when it again becomes visible, and continues increasing during the remaining three months of its period. Such is the general course of its phases. It does not always, however, return to the same degree of... | |
 | Sir John Frederick William Herschel - 1833 - 444 pagine
...months, till it becomes completely invisible, in which state it remains during about five months, when it again becomes visible, and continues increasing during the remaining three months of its period. Such is the general course of its phases. It does not always, however, return to the same degree of... | |
 | John Farrar - 1834 - 504 pagine
...months, till it becomes completely invisible, in which state it remains during about five mouths, when it again becomes visible, and continues increasing during the remaining three months of its period. Such is the general course of its phases. It does not always, however, return to the same degree of... | |
 | Denison Olmsted - 1839 - 300 pagine
...about three months, until it becomes completely invisible, and remains so about five months, when it again becomes visible, and continues increasing during the remaining three months of its period. Another very remarkable variable star is Algol (Beta Persei). It is usually visible as a star of the... | |
 | Denison Olmsted - 1839 - 304 pagine
...about three months, until it becomes completely invisible, and remains so about five months, when it again becomes visible, and continues increasing during the remaining three months of its period. Another very remarkable variable star is Algol (fi Persei). It is usually visible as a star of the... | |
 | 1840 - 460 pagine
...months, till it becomes completely invisible, in which state it remains about five months, when it again becomes visible, and continues increasing during the remaining three months of its period ; but it does not always return to the same degree of brightness, nor increase and diminish by the... | |
 | Denison Olmsted - 1841 - 486 pagine
...about three months, until it becomes completely invisible, and remains so about five months, when it again becomes visible, and continues increasing during the remaining three months of its period. Another very remarkable variable star is Algol, (Beta Persei.) It is usually visible as a star of the... | |
 | William Benjamin Carpenter - 1843 - 290 pagine
...H. Ware of Boston, New England. to its complete extinction at intervals, is the one named Ginicron, in the constellation Cetus; its variation was first...star in the constellation Cygnus, the period of whose vsftiation is about 13 months, was scarcely visible, during three years, at the times when it ought... | |
 | Denison Olmsted - 1844 - 292 pagine
...about three months, until it becomes completely invisible, and remains so about five months, when it again becomes visible, and continues increasing during the remaining three months of its period. Another variable star in Perseus, goes through a great variety of changes in the course of three days.... | |
 | John Lee COMSTOCK (and HOBLYN (Richard Dennis)), John Lee COMSTOCK - 1846 - 506 pagine
...months, till it becomes completely invisible, in which state it remains during about five months, when it again becomes visible, and continues increasing during the remaining three months of its period."—Herschel's Astronomy. 762. Temporary stars.—Sir J. Herschel describes other phenomena... | |
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It appears once in eleven months, remains at its greatest brightness about a fortnight, being then, on some occasions, equal to a star of the second magnitude. It then decreases about three months, until it becomes completely invisible, and remains so... 
