Miscellaneous Documents: 30th Congress, 1st Session - 49th Congress, 1st Session, Volume 9

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Page 496 - All the distances that can be observed on the same day, are grouped together under that date ; and the columns are read from left to right, across both pages of the same opening.
Page 502 - In the case of total and annular eclipses, a rough estimate of the magnitude of the eclipse may be obtained from the position of the; place relatively to the central line and to the limit. On the central line, the eclipse is annular or total, while on the limit, the limb of the moon only grazes that of the sun. More Accurate Computations.
Page 498 - ... required. The daily motion is given for the moment of Greenwich mean noon. The column Reduction to Orbit gives the correction to be applied to the heliocentric longitudes in order to obtain the longitude counted along the orbit of the planet. This longitude is equal to the distance of the node from the mean equinox, plus the distance of the planet from the node. The heliocentric latitude is counted from the moving plane of the ecliptic. The Logarithm of Radius Vector is the logarithm of the distance...
Page 491 - A Solar Day is the interval of time between two successive transits of the sun over the same meridian; and tho hour-angle of the sun is called Solar Time.
Page 500 - July 1st precedes the upper one of the same date. A transit occurring very nearly at noon may also be identified without a computation to ascertain the actual mean date, by simply noting the tenth of a day in the column of Mean Solar Date.
Page 496 - ... used for greater precision. Page XII contains also the Phases of the Moon and the dates of the Moon's Perigee and Apogee, or least and greatest distances from the earth.
Page 495 - BOWDITCH'S Navigator. This column may be used in converting sidereal time to mean time instead of that on page II. As an illustration, let us take Example 3, above. It is seen in advance that the sum of the mean time of sidereal noon and the given sidereal time is less than 24 hours. Were it more than 24 hours, the mean time of sidereal noon should be taken out for May 13, that is the preceding astronomical day.
Page 502 - is given the Greenwich mean time at which the earth first touches the moon's penumbra, and the longitude and latitude of the point of touching. The " Central eclipse begins " when the axis of the moon's shadow first touches the earth, and the longitude and...
Page 497 - ... it would have appeared from the centre of the earth at the moment of observation. With this distance and the distances in the Ephemeris of the same bodies on the same day, the Greenwich mean time of the observation can be found. To lessen the labor of computation, there is given in the...

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