Astronomic latitude is calculated from angles measured between the zenith and stars whose declination is accurately known. |
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The angle between the astronomic and geodetic normals is usually a few seconds of arc but it is important in geodesy. |
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Short astronomic cycles can be the difference between the tides or the spring tide every two weeks. |
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Eventually, small changes in astronomic parameters can cause large changes in sedimentary environment and sedimentation. |
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Most of these cyclic changes are caused by astronomic cycles. |
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