A Text book of Field Astronomy for Engineers
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73. Gradienter Latitudes. Example. We may now write the equation for zenith-telescope latitudes in the form, (141) through which a value of the latitude may be derived from each pair of stars observed, if k is known. This value of a revolution of the screw, k, may be determined by measuring with the gradienter a known angle, such as the difference of declination of two stars, or it may be treated as an unknown quantity whose value is to be derived from the latitude observations themselves. In t...he latter case at least two pairs of stars, preferably ten to twenty pairs, must be observed for the deter- mination of the two unknowns, and k, and these should be so selected that in one pair the sum of the declinations is greater than 20 and in the other pair is less than 20. The following example represents the observation 166 FIELD ASTRONOMY.
and reduction of a single pair of stars made with the instrument shown in Plate I, whose errors are investi- gated in 72. The gradienter readings as directly observed are given in the column marked R, and in the following column there are given the corrections to these readings as interpolated from the table at p.
What to read after A Text book of Field Astronomy for Engineers?
You can find similar books in the "Read Also" column, or choose other free books by George C George Cary Comstock to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
73. Gradienter Latitudes. Example. We may now write the equation for zenith-telescope latitudes in the form, (141) through which a value of the latitude may be derived from each pair of stars observed, if k is known. This value of a revolution of the screw, k, may be determined by measuring with the gradienter a known angle, such as the difference of declination of two stars, or it may be treated as an unknown quantity whose value is to be derived from the latitude observations themselves. In t...he latter case at least two pairs of stars, preferably ten to twenty pairs, must be observed for the deter- mination of the two unknowns, and k, and these should be so selected that in one pair the sum of the declinations is greater than 20 and in the other pair is less than 20. The following example represents the observation 166 FIELD ASTRONOMY.
and reduction of a single pair of stars made with the instrument shown in Plate I, whose errors are investi- gated in 72. The gradienter readings as directly observed are given in the column marked R, and in the following column there are given the corrections to these readings as interpolated from the table at p.
What to read after A Text book of Field Astronomy for Engineers?
You can find similar books in the "Read Also" column, or choose other free books by George C George Cary Comstock to read onlineMoreLess
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