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TABLE SHOWING THE HEIGHT OF HIGH WATER ABOVE THE MEAN LEVEL OF LOW WATER ORDINARY SPRING TIDES AT THE LONDON DOCKS FOR 1880. TO FIND THE DEPTH AT HIGH WATER OVER THE SILLS AT THE ENTRANCE OF THE DOCKS: HEIGHT GIVEN IN THE TABLE, add, FOR WAPPING ENTRANCE, 2 FT. 9 IN.; SHADWELL (UPPER ENTRANCE) 5 FT. 2 IN., (LOWER ENTRANCE) 7 FT. 10 IN. SOME OF THE HIGHEST SPRING TIDES ARE DISTINGUISHED BY (*).

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TABLE SHOWING THE HEIGHT OF HIGH WATER AT THE LONDON DOCKS FOR 1880-(continued).

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A fall of an inch in the barometer will cause the tide to rise about 13 inches above the usual height, and vice versa when the barometer is high.

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OCCULTATIONS OF FIXED STARS, &c., BY THE MOON, VISIBLE AT GREENWICH.

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OCCULTATIONS OF FIXED STARS, &c., BY THE MOON, VISIBLE AT GREENWICH.

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** The Angles are reckoned towards the right hand round the circumference of the Moon's image as seen in an inverting telescope. For direct image, take the opposite points; that is, in numbers, add or subtract 180°. The Angles from North Point and Vertex" will also indicate the position of the meridian; thus, if the larger angle be that in the left-hand column, the objects will be situated on the left of the meridian; and vice versa. The "Sidereal Times" are given for the use of those having observatories and astronomical Sidereal clocks. General readers will take the times of "disappearance" and "reappearance" from the columns headed "Mean Time," and they will bear in mind that they are always counted from noon. When the time stated is less than 12h it therefore denotes the time in the afternoon: when it exceeds the 12h, by rejecting the 12h the remainder will indicate the time on the following morning; and, in each case, according to Greenwich mean time, which is now uniformly exhibited by railway and public clocks in the United Kingdom.

MEMORANDA FOR NEXT YEAR, 1881.

N.B. As towards the end of the year, or even earlier, information concerning the coming year is often wanted, we give a synopsis of the information most required :--1881 I.-Beginnings of the Months and Sundays in 1881.

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10

A TABLE OF THE DURATION OF MOONLIGHT AFTER SUNSET AND
BEFORE SUNRISE THROUGHOUT THE YEAR 1880.

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indicates the

The figures under the name of each month denote the number of hours nearly, between sunset and sunrise. The points denote the hours of darkness; and their position....." one..... before, the other after midnight. The blank spaces show when it is moonlight.

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