Laboratory Astronomy
Laboratory Astronomy
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In our eReader you can find the full English version of the book. Read Laboratory Astronomy Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Laboratory Astronomy
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315 in the same position, the altitude arc is then used to mark the points of the ecliptic which are 18 below the horizon. These are found to be at points occupied by the sun January 2 and May 25, and between these dates, therefore, the whole cross may be above the horizon in latitude 28 in the full darkness of night, the sun being below the twilight limit.
Example 36. What is the latest date at which we can see Sirius in the evening twilight in latitude 42?
Sirius is visible when the sun is ab...out 10 below the horizon, and cannot be seen later than the day on which he sets at the instant that the sun is 10 below the horizon.
Rectifying for 42 and bringing Sirius to the western horizon, we find that the point of the ecliptic which is 10 below the horizon is 136 LABORATORY ASTRONOMY the place occupied by the sun on May 15, which is, therefore, the required date.
Example 37. Between what dates is the sun visible at midnight at the North Cape, in latitude 70 north ?
Eectifying the globe for 70 north and rotating the globe slowly, it is found that points on the ecliptic in longitudes 58 and 122 can be brought exactly to the north point of the horizon ; any point between these may be brought to the meridian below the pole and above the horizon.
What to read after Laboratory Astronomy?
You can find similar books in the "Read Also" column, or choose other free books by Willson, Robert Wheeler, 1853-1922 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
315 in the same position, the altitude arc is then used to mark the points of the ecliptic which are 18 below the horizon. These are found to be at points occupied by the sun January 2 and May 25, and between these dates, therefore, the whole cross may be above the horizon in latitude 28 in the full darkness of night, the sun being below the twilight limit.
Example 36. What is the latest date at which we can see Sirius in the evening twilight in latitude 42?
Sirius is visible when the sun is ab...out 10 below the horizon, and cannot be seen later than the day on which he sets at the instant that the sun is 10 below the horizon.
Rectifying for 42 and bringing Sirius to the western horizon, we find that the point of the ecliptic which is 10 below the horizon is 136 LABORATORY ASTRONOMY the place occupied by the sun on May 15, which is, therefore, the required date.
Example 37. Between what dates is the sun visible at midnight at the North Cape, in latitude 70 north ?
Eectifying the globe for 70 north and rotating the globe slowly, it is found that points on the ecliptic in longitudes 58 and 122 can be brought exactly to the north point of the horizon ; any point between these may be brought to the meridian below the pole and above the horizon.
What to read after Laboratory Astronomy?
You can find similar books in the "Read Also" column, or choose other free books by Willson, Robert Wheeler, 1853-1922 to read onlineMoreLess
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