Eratosthenes

Printable rulers

4 Printable rulers , double scale value (degree-centimeter)
4 bands (width=4cm; length=25cm) on each of the 4 sheets of paper A4format
total length of the 4 rulers : 4m

For a 1m high gnomon
The shadow is cast on the paper ruler
You measure the length of the shadow
You directly read the value of the angle of the sun

Ruler#1(0cm-100cm)



You just need this ruler for a measurement on:

summer solstice (0° < latitude < 69°)
equinox (0° < latitude < 45°30’)
winter solstice (0° < latitude < 22°)

Ruler#2(100cm-200cm)



You need these 2 rulers (#1 & #2) for a measurement on:

summer solstice (69° < latitude < 87°)
equinox (45°30’ < latitude < 63°30’)
winter solstice (22° < latitude < 40°)


Ruler#3(200cm-300cm)



You need these 3 rulers (#1 & #2 &#3 ) for a measurement on:

summer solstice (toute latitude)
equinox (63°30’ < latitude < 71°30’)
winter solstice (40° < latitude < 48°)


Ruler#4(300cm-400cm)



You need these 4 rulers (#1 & #2 & #3 & #4 ) for a measurement on:

summer solstice (toute latitude)
equinox (71°30’ < latitude < 76°)
winter solstice (48° < latitude < 52°30’)


Attached documents

regle #4

31 August 2007
Document : PDF
1 Mb

(300cm-400cm)


regle #1

1 January 1996
Document : PDF
1.1 Mb

(0cm-100cm)


regle #2

1 January 1996
Document : PDF
1.1 Mb

(100cm-200cm)


regle #3

1 January 1996
Document : PDF
1 Mb

(200cm-300cm)


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