Henry Gellibrand
Henry Gellibrand
1597-1636
English astronomer who discovered secular variations in magnetic declination—changes over time in the acute angle between magnetic and true north. Edmund Gunter's declination measurements at Limehouse in 1622 were about 5° less than William Borough's 1580 results. Gunter attributed the discrepancy to errors by Borough. Gellibrand and John Marr's 1633 measurements showed a further decrease, which Gellibrand announced in 1635. Gellibrand also made mathematical contributions to navigation including a method for determining longitude at sea.
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Dispersion measures (Statistics) , interquartile range See measures of variation.
mean deviation See measures of variation. Measurement , British mathematician and physicist William Thomson (1824–1907), otherwise known as Lord Kelvin, indicated the importance of measurement to science:… Measurement , British mathematician and physicist William Thomson (1824–1907), otherwise known as Lord Kelvin, indicated the importance of measurement to science:… Declination , dec·li·na·tion / ˌdekləˈnāshən/ • n. 1. Astron. the angular distance of a point north or south of the celestial equator. Compare with right ascension… Measure , meas·ure / ˈmezhər/ • v. [tr.] 1. ascertain the size, amount, or degree of (something) by using an instrument or device marked in standard units or b… Measurement By Fiat , measurement by fiat Procedures for quantification of data which make no claim to be representational measurement, but rather assign numbers on the ba…
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Henry Gellibrand