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Brian Macpherson

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last 3 solved tasks
Find the country and its capital city, using the move of a chess knight. First letter is L. Length of words in solution: 7,8.
MATH PUZZLE: Can you replace the question mark with a number?
Find the first and the last name of a famous person. Text may go in all 8 directions. Length of words in solution: 5,7.

Henry Gellibrand

Born 17 Nov 1597; died 16 Feb 1636 at age 38.English astronomer and mathematician who co-discovered (with John Marr) the geomagnetic secular variation. This refers to the magentic declination of the earth's magnetic field, the angle between magnetic north and true north, changing on a long-term time scale over years. He detected the direction of a compass needle in London had changed by seven degrees over a period of a half-century.He became professor of astronomy at Gresham College, London on 2 Jan 1627. His navigation textbooks helped improve English navigation at the time.Usingmanuscripts left unfinished whenhis friend Henry Briggsdied (1630), he completed volume two of Briggs'sTrigonometrica Britannica, in 1633.GellibrandpublishedA Discourse Mathematicall on the Variation of the Magneticall Needle, in 1635. He died the following year, at age 39.«[Image: Title page of Gellibrand's Discourse (1635).]

Of all my books, my...

“Of all my books, my favorite is the one I received last Christmas. There is no tome like the present.”

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