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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)

Published byToby Aldous Cox Modified over 9 years ago

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Presentation on theme: "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)"— Presentation transcript:

1 Sundial Basics Paul Calder Flinders University

2 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

3 Heliocentric View

4 Geocentric View Fix it for southern hemisphere!

5 Spherical Coordinates

6 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)

7 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

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

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