The library of Eratosthenes

Printable rulers

1996 by perbosc

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#1(0cm-100cm) + Ruler#2(100cm-200cm)


    You need these 2 rulers for a measurement on:

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


  • Ruler#1(0cm-100cm) + Ruler#2(100cm-200cm) + Ruler#3(200cm-300cm)


    You need these 3 rulers for a measurement on:

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


  • Ruler#1 + Ruler#2 + Ruler#3 + Ruler#4(300cm-400cm)


    You need these 4 rulers for a measurement on:

    summer solstice (toute latitude)
    equinox (71°30’ < latitude < 76°)
    winter solstice (48° < latitude < 52°30’)
    PDF - 1.1 Mb
    regle #1
    (0cm-100cm)
    PDF - 1.1 Mb
    regle #2
    (100cm-200cm)
    PDF - 1 Mb
    regle #3
    (200cm-300cm)
    PDF - 1 Mb
    regle #4
    (300cm-400cm)

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