WILLEBRORD See also:

• SNELL, HANNAH (1723–1992)
• SNELL, JOHN (1629-1679)
• WILLEBRORD SNELL (1591-1626)

SNELL (1591-1626)  , commonly known as SNELLIUS, Dutch astronomer and mathematician, was See also:

• BORN, IGNAZ, EDLER VON (1742–1791)

born at See also:

• LEIDEN

Leiden in 1591 . In 1613 he succeeded his See also:

• FATHER

father See also:

• RUDOLPH
• RUDOLPH (d. 1o8o)
• RUDOLPH, or RAOUL

Rudolph See also:

• SNELL, HANNAH (1723–1992)
• SNELL, JOHN (1629-1679)
• SNELL, WILLEBRORD (1591-1626)

Snell (1546–1613) as See also:

• PROFESSOR (the Latin noun formed from the verb profiteri, to declare publicly, to acknowledge, profess)

professor of See also:

• MATHEMATICS (Gr. /saBnµar1Kil, Sc. vOcvn or E7rlQTt'µn; from p iN.La, "learning" or "science ")

mathematics in the university of Leiden . In 1615 he planned and carried into practice a new method of finding the dimensions of the See also:

• EARTH
• EARTH (a word common to Teutonic languages, cf. Ger. Erde, Dutch aarde, Swed. and Dan. jord; outside Teutonic it appears only in the Gr. 'pq'e, on the ground; it has been connected by some etymologists with the Aryan root ar-, to plough, which is seen in
• EARTH, FIGURE OF
• EARTH, FIGURE OF THE

earth, by determining the distance of one point on its See also:

• SURFACE

surface from the parallel of another, by means of a triangulation . His See also:

• WORK

work Eratosthenes Batavus, published in 1617, describes the method and gives as the result of his operations between See also:

• ALKMAAR

Alkmaar and See also:

• BERGEN

Bergen-op-Zoom a degree of the See also:

• MERIDIAN
• MERIDIAN (from the Lat. meridianus, pertaining to the south or mid-day)

meridian equal to 55,100 toises= 117,449 yds . (A later recalculation gave 57,033 toises =121,569 yds., after the application of some corrections to the See also:

• MEASURES

measures indicated by himself.) Snell also distinguished himself as a mathematician, and discovered the See also:

• LAW
• LAW (0. Eng. lagu, M. Eng. lawe; from an old Teutonic root lag, " lie," what lies fixed or evenly; cf. Lat. lex, Fr. loi)
• LAW, JOHN (1671—1729)
• LAW, WILLIAM (1686-1761)

law of See also:

• REFRACTION
• REFRACTION (Lat. refringere, to break open or apart)

refraction, 'in 1621 (see See also:

• LIGHT

LIGHT) . He died at Leiden on the 3oth of See also:

• OCTOBER

October 1626 . In addition to the Eratosthenes Batavus he published Cyclometria sive de circuli dimen,.ione (1621), and Tiphys Batavus s . Histiodromice, de navium cursibus et re navali (1624) . He also edited Coeli et siderum in eo errantium observationes Hassiacae (1618), containing the astronomical observations of See also:

• LANDGRAVE (Ger. Landgraf, from Land, " a country" and Graf, "count" )

Landgrave See also:

• WILLIAM
• WILLIAM (1143-1214)
• WILLIAM (1227-1256)
• WILLIAM (1J33-1584)
• WILLIAM (A.S. Wilhelm, O. Norse Vilhidlmr; O. H. Ger. Willahelm, Willahalm, M. H. Ger. Willehelm, Willehalm, Mod.Ger. Wilhelm; Du. Willem; O. Fr. Villalme, Mod. Fr. Guillaume; from " will," Goth. vilja, and " helm," Goth. hilms, Old Norse hidlmr, meaning
• WILLIAM (c. 1130-C. 1190)
• WILLIAM, 13TH

William IV. of See also:

• HESSE
• HESSE (Lat. Hessia, Ger. Hessen)

Hesse . A See also:

• TRIGONOMETRY (from Gr. rpiywvov, a triangle, /ATpov, measure)

trigonometry (See also:

• DOCTRINE

Doctrine triangulorum,) by him was published a See also:

• YEAR

year after his See also:

• DEATH

death .