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 imaginary line is called the Tropic of Cancer because when the Sun reaches the zenith at this latitude, it is entering the astrological sign of Cancer (summer solstice in the northern hemisphere).When it was named, the Sun was also in the direction of the constellation Cancer (Latin for crab).orld map showing the Tropic of Cancer. The Tropic of Cancer, also referred to as the Northern Tropic, is the most northerly circle of latitude on the Earth at which the Sun may appear directly overhead at its culmination.