The electron density of these two bonding electrons is concentrated in the region between the two atoms, which is the defining quality of a sigma bond. Two p-orbitals forming a pi-bond. A double bond between two atoms is formed by the sharing of two pairs of electrons, one in a sigma bond and one in a pi bond, with electron density concentrated on two opposite sides of the internuclear axis.
Looking at the globe as normally seen with the north at the top, the Tropic of Cancer is the upper latitude and the ânâ in caNcer comes before âpâ in caPricorn. ). The Tropic of Cancer was named because at the time of its naming, the sun was positioned in the Cancer constellation during the June solstice. Likewise, the Tropic of Capricorn was named because the sun was in the constellation Capricorn during the December solstice.
The sun is directly overhead on the Tropic of Capricorn at some time on December 21 or 22.    That moment is technically the beginning of Winter in the northern hemisph â¦ ere, and the beginning of Summer   in the southern hemisphere.