Letters On Astronomy, Addressed to a Lady: in Which the Elements of the ...
Letters On Astronomy, Addressed to a Lady: in Which the Elements of the ...
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Could chronom- eters always be depended on to such a d^ee of accu- racy as this, we should hardly desire any diing better for determining the longitude of different places on the earth. A recent determination of the longitude of the City Hall in New York, by means of three chronom- eters, sent out from London expressly for that purpose, did not differ from the longitude as found by a sdar eclipse (which is one of the best methods) but a sec- ond and a quarter.
Eclipses of the sun and moon furni...sh the means of ascertaining the longitude of a place, because the en- trance of the moon into the earth's shadow in a lunar eclipse, and the entrance of the moon upon the disk of the sun in a solar ecKpse, are severally examples of one of those instantaneous occurrences in the heavens, which afford the means of comparing the times of different places, and of thus determining ihek differ- LONGrrUDE. SIS ences of longitude. Thus, if t|ie commenceinent of a kmar eclipse was seen at one place an hoursooner than at another, the two places would be fifteen degrees apart, in longitude ; and if the longitude of one of the places was known, that of the other would become known also.
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You can find similar books in the "Read Also" column, or choose other free books by Denison Olmsted to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Could chronom- eters always be depended on to such a d^ee of accu- racy as this, we should hardly desire any diing better for determining the longitude of different places on the earth. A recent determination of the longitude of the City Hall in New York, by means of three chronom- eters, sent out from London expressly for that purpose, did not differ from the longitude as found by a sdar eclipse (which is one of the best methods) but a sec- ond and a quarter.
Eclipses of the sun and moon furni...sh the means of ascertaining the longitude of a place, because the en- trance of the moon into the earth's shadow in a lunar eclipse, and the entrance of the moon upon the disk of the sun in a solar ecKpse, are severally examples of one of those instantaneous occurrences in the heavens, which afford the means of comparing the times of different places, and of thus determining ihek differ- LONGrrUDE. SIS ences of longitude. Thus, if t|ie commenceinent of a kmar eclipse was seen at one place an hoursooner than at another, the two places would be fifteen degrees apart, in longitude ; and if the longitude of one of the places was known, that of the other would become known also.
What to read after Letters On Astronomy, Addressed to a Lady: in Which the Elements of the ...?
You can find similar books in the "Read Also" column, or choose other free books by Denison Olmsted to read onlineMoreLess
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