ΕΡΑΤΟΣΘΕΝΗΣ

ERATOSTHENIS 2019

29th Chalkida Kindergarden

Etwinning

presentation of program in 29th Chalkida kindergarden

Αctivities

children are painting

plastelini

kollaz

video

creating triangles

the weel

measurements

triangles from the center of the circle

trigonometric circle

shadow lenth

ppresentation of children

29TH CHALKIDA KINDERGARDEN IN ZEE MAPS

PRESENTATION OF CHILDREN

the children painted the experiment of Eratosthenes (his ideas about how the sun's rays fall on earth and the empirical measurement of angles (sun rays, an extension of a rod in Alexandria, an extension of a well in the center of the earth) and their equality

children painting

τα έργα των παιδιών

kollaz

children are making a group kollaz

plastelini

with plasticine (the sticks drop vertically into the well in the Syne)

children is explaining .

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with the weel

we did an experiment to see the Eratosthenis well in the enclosure

we did a small experiment to see the Eratosthenes well in the enclosure, the shadow of the rod in the Syne, the change in the size of the shadow of the pole and its movement depending on the movement of the lens

creating triangles with a cord

creating triangles with three points of space

height measurements of various objects and shadow lengths, recording them

μετρήσεις ύψους διαφόρων αντικειμένων και μήκη σκιών , καταγραφή αυτών

height measurements of various objects and shadow lengths, recording them

building a trigonomertic circle

building a trigonometric circle with the dolls of our class

creating triangles from the center of the circle with defined two sides and forming the third side

extensions of the shadow as to the circumference of the circle with a cord

shadow lenth measurements at different times and recording them

measurements of shadow length at different times and recording of them We measured a 35-centimeter bar section protruding from a 70 cm rod fixed to a rectangle: 1st measurement, hour: 9: 10, shadow length 53 cm, 2nd measurement, 10:00, shadow length bar protrusion 41 cm 3rd measurement, hour 10:50, bar protrusion length 32 cm 4th measurement, time 11:22, bar stitch length 26 cm 5th measurement, time 12:00, bar stitch length 25 cm 6th measurement, hour 12:34, bar protrusion length 23 cm 7th measurement, 12:40, length projection shadow rod 25 cm

shadow length measurements with parents

Eratoshenis experiment 21th March

We measured a roll of kitchen towels. The height of 22.5. We measured the length of the shadow in the following times 12:33, 12:35, 12:39, 12:43 and we found the length of the shadow in each measurement

At 12:35, we found the smallest shadow length, which was 19 centimeters. From a computer program we put the elements of the height of the object, the smallest shadow we found, our distance from Ecuador, and the system took out the rest of it. So we found angle 40.17 radius 6196.62 (difference in radius 4.15)