 ... three 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...  Mechanical Philosophy, Horology, and Astronomy - Page 421by William Benjamin Carpenter - 1848 - 575 pagesFull view - About this book
 | Sir John Frederick William Herschel - Astronomy - 1833 - 444 pages
...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 - Astronomy - 1834 - 504 pages
...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 Frederick William Herschel - Astronomy - 1834 - 406 pages
...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... | |
 | Denison Olmsted - Astronomy - 1839 - 308 pages
...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 (P Persei). It is usually visible as a star of the second... | |
 | Denison Olmsted - Astronomy - 1839 - 300 pages
...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... | |
 | Child rearing - 1840 - 460 pages
...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 - Astronomy - 1841 - 486 pages
...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... | |
 | James Middleton (F.G.S.) - 1842 - 202 pages
...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. Such is the general course of its phases. It does not always, however, return to the same degree of... | |
 | William Benjamin Carpenter - 1843 - 290 pages
...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... | |
 | Thomas Dick - Astronomy - 1844 - 460 pages
...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... | |
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