Solar Opposites

   Inner planets like all the planets as viewed from Earth appear to be moving from one side of the Sun to the other. As a result the visible planets are seen either in the morning skies when located west from the Sun and rising before the Sun rises, or in the evening skies east from the Sun, and setting after the Sun sets. For the two inner planets, Mercury and Venus, these positions on either side of the Sun are known as elongations – western or greatest western elongation and its counterpart, eastern or greatest eastern elongation.
   As the graphics below show, both inner planets reach their respective elongations – but on opposite sides of the sun. Monday March 23rd Mercury is at western elongation in the morning skies, and on Tuesday March 24th Venus will be at eastern elongation in the evening skies.


Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to return to bobs-spaces.

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