Circle of brightness

Both the Tropic of Cancer and the Tropic of Capricorn have a direct relationship to the summer solstice, for both are the imaginary line on Earth in which the Sun’s rays are completely vertical at the instant of the solstice, ie when the Sun will be exactly in the center of the sphere of visible sky when the solstice occurs and, therefore, the shadow of any object will have null longitudinal component in said line. This occurs once a year for each hemisphere, and also the equality in time between day and night. The northern hemisphere corresponds to the Tropic of Cancer and the Southern Hemisphere, the Tropic of Capricorn.#oscarps copyright

Source: Circle of brightness

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