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Dr. Young's Refractions, the Barometer being at 30 inches, and the inter nal Thermometer at 50, or the external at 47, degrees; with the corrections one inch in the barometer, and for one degree in the thermometer of Fahrenheit. From page 19 of Vol. 1st of Pearson's Practical Astronomy.

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The correction for an increase of altitude of one inch in the barometer, or for a depression of one degree in the thermometer, is to be added to the tabular refraction; but when the barometer is lower than 30 inches, or the thermometer higher than 50 degrees, the correction becomes subtractive.

When great accuracy is required, 0,003 inch should be deducted from the observed height of the barometer, for each degree that the thermometer near it, is above 50 degrees, and the same quantity added, for an equal depression.

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Logarithm for converting Sidereal into Mean Solar Time + 9.9988126

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"L Mean Solar into Sidereal Time + 0.0011874

A second of time, at the Equator, contains 1521 feet.

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Dr. Young's Refractions, the Barometer being at 30 inches, and the nal Thermometer at 50, or the external at 47, degrees; with the corr for one inch in the barometer, and for

one degree in the the eter of Fahrenheit. From page 19 of Vol. 1st of Pearson's Practi tronomy.

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2.30,5 5,0

2.16,5 4.0

1.58,8 8,5

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Elements of the Eclipse of the Sun on Sunday, November 30th, Mean Time at Greenwich.

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Sun's Horizontal Parallax 8.70". Obliquity of the Ecliptic 23° 27' 40.4''.

Lunar Elements, computed for every half hour.

Longitude. Latitude. Right Asc. Declination. Equat. Par. Semi. Diam.

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H. M.

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246 25 48.0460 45.11 244 44 59.2

-20 24 16.3

60 25.31

16 27.89

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Elements of the Eclipses of January 9th, June 7th, June 21st, and December 15th, Mean Time at Greenwich.

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The sign+prefixed to the hourly motion of the Moon in latitude indicates that she is appreaching, and the sign- that she is receding from, the north pole of the ecliptic.

The hourly increase of the Sidereal time is constantly 9,8565 seconds.

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