# Cañada de Gómez, Argentina

**March 2007**

Flag | City | Country | School | Latitude (°) +N/-S | Longitude (°) +E/-W |
---|---|---|---|---|---|

Cañada de Gómez | Argentina | Centro Interactivo de Ciencia y Tecnología | -32.817 | -61.400 |

Date | Gnomon | Shadow | Angle |
---|---|---|---|

March 18 | cm | cm | -33°12’ |

March 20 | cm | cm | -30°04’ |

Before... and after noon...

When begun the campaign 2006-2007, I was several months without other measurements from partners, to calculate the terrestrial meridian. To solve this problem, I used Cooper formula (1969):

Declination = - 23.45 sin (2*PI* (d+284) /365

Where d is the day of the year.
In order compute the distance between our parallel and the one of another city located in another meridian , we used formulate:

d = (111.3 km) · arcos ( sin a · sin b + cos a . cos b cos · cos(c- e))

Where a and b they are the latitudes of both cities, c and e are the longitudes. But that formula delivers the distance between cities; that does not interest to us: The reason is that c=e (both in he himself meridian, and different parallel), thus:
d = (111.3 km) · arcos ( sin a · sin b + cos a . cos b )

We are interested by the ditance to the equator, so:

a=0 and b= our latitude (or yours).

d = (111.3 km). arccos (cos b) = (111.3 km). b

We took 111.3 for a circumference from 40075.2 km.

When there is no sun...

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