As the Earth orbits elliptically around the sun, it is at its closest point in January and the farthest in July. Near the summer solstice, typically around June 21, the Northern Hemisphere is in a ...
Pambudi, Afief D. Faus, Michael Ahmad, Fauzia and Zoubir, Abdelhak M. 2018. Robust Detection for Forward-Looking GPR in Rough-Surface Clutter Environments. p. 2077.