Sundial Basics Paul Calder Flinders University. Planetary Motion Earth rotates on its axis in 24 hours => day and night Earth orbits the sun in 365(ish)

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Sundial Basics Paul Calder Flinders University

Planetary Motion Earth rotates on its axis in 24 hours => day and night Earth orbits the sun in 365(ish) days => year The rotational axis is tilted => seasons The orbit is (slightly) elliptical => minor effects

Heliocentric View

Geocentric View Fix it for southern hemisphere!

Spherical Coordinates

Find These Earthfacts Planetary radius Axial tilt Rotational speed (angular velocity) Dates of solstices, equinoxes Mean orbital radius (and max, min) Mean orbital speed (and max, min) Date of perihelion (closest to sun)

Sundials on the Web Find out about one of these sundials Equatorial, polar, horizontal, analemmatic, diptych, cylinder (shepherds) Prepare a 5-minute presentation What, how, when, who, pics

Next Week Calculating sun position Present your report on your sundial research

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