analemma across the latitudes

Analemma, the pattern traced by the (solar) noon sun through the year, makes a figure-8.  That figure-8 gets squished and rotated as you move from the pole to the equator.

analemma

This was generated using a few lines of python, the pyephem package, and matplotlib.  The altitude and azimuth of the sun was calculated each day for a year at each latitude.

NSTA names outstanding science books of 2012

Mighty Mars RoversThe National Science Teachers Association has released it’s list of outstanding science trade books for K-12 released in 2012. These look like excellent selections:

Complete list is here: http://www.nsta.org/publications/ostb/ostb2013.aspx

for science educators, outreach volunteers, amateur astronomers, or maybe just me