No NooN SHADOW DAYS

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    09 Jan 05 Apr 09 May 12 June 13 June 03 August 06 September 05 December 18 December
    Rio de Jan. Medellin Hyderabad Meghpar and Naranpar Bhuj Hyderabad Medellin Piranguinho Rio de Jan.
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    29 March 09 May 05 June 13 June 10 Dec
    Kuantan Hyderabad Shenzhen Bhuj Rio de Jan.
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    14 Feb 21 June 03 June 01 April 31 March 15 May 27 July
    Mayotte Ujjain Vadodara Kuantan Kuantan Mumbai Mumbai
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    There are special days, special places , when and where the sun casts no shadow at noon.
    Those conditions are the same as those of the first Eratosthenes experiment between Alexandria and Aswan, 2200 years ago.

    Eratosthenes, at the time Director of the Great Library of Alexandria in Egypt, proposed a purely geometrical method to measure the length of the Earth’s meridian (circle passing through the poles).
    He started by using the observation of shadows made at two different places, Alexandria and Syene (now Aswan) distanced approximately 800 km apart (distance estimated in relation to the time taken by a caravan of camels to connect the two towns !) at the time of the Summer solstice and at noon local solar time.