4 PRINCE EDWARD ISLAND CALENDAR. Morning and Evening Stars- Mercury will be a Morning Star until the 10th Janu¬ ary; then an Evening Star until the 1st June; a Morn¬ ing Star until the 10th September, and an Evening Star the remainder of the year. Venus will be an Evening Star until 8th May; then a Morning Star the rest of the year. Mars will be an Evening Star until 5th June; then Morning Star until the close of the year. Jupiter will be an Evening Star until 12th April, then a Morning Star the rest of the year. Saturn will be an Evening Star until 9th July, and a Morning Star until the end of the year. ECLIPSES. In the Year 1857 there will be two Eclipses, both.of the Sun,— I. A Total Eclipse of the Sun, March 25th visible in parts of Australia, North and , of , Isthmus of Panama, N. W. Coast of , &c. 2. An Annular Eclipse of the Sun, September 17, visible in parts of Africa and Asia, China, , Australia, , &.c. Chronological Cycles, &c Golden Number Epact Solar Cycle 15 A Dominical Letter D Roman Indiction 15 Julian Period 6570 The Year 5GI8 of the Jewish Era commences on Sept. 19, 1S57. Ramadan (month of Abstinence observed by the Turks) commences on April 25, 1857. The year 1274 of the Mahommedan Era commences Aug, 12, 1857. Commencement of the Seasons- Spring begins March 20. I Autumn begins Sept. 22. Summer " June 21. | Winter " Dec. 21. Tides.— pronounces the formula for deducing the tides the most difficult problem of celestial mechanics. It somrfimes-tiappens that the tide comes in several hours later or earlier than the most learned calculation would determine; and this in consequence of the strength and direction of the wind, which the calculator cannot reckon upon.