Jupiter, Venus pair up Tuesday night
This week Jupiter and Venus will be appearing incredibly close in the western sky after sunset. We will even have a little extra time to enjoy this conjunction, the best we will experience until late next summer, but more on that at the end.
Posted — UpdatedIf clouds block the view, these planets will continue to appear close for the next week or so. Each evening they’ll separate by another half degree. The next planetary conjunction will occur the last week of August 2016, again with Venus and Jupiter but with their positions swapped thanks to variations in their orbit. The pair will be even closer then, about 1/10th of a degree apart, low of the western horizon.
When those physical and astronomical measurements vary by more than 0.9 seconds, a leap second is added or subtracted. So far, leap seconds have only been added 26 times as of Tuesday’s addition, either on the last day of June or the last day of December.
The International Earth Rotation and Reference Systems Service in Paris, along with the Rapid Service and Predictions of Earth Orientation Parameters at the United States Naval Observatory, issue a directive to add a leap second.
Tony Rice is a volunteer in the NASA/JPL Solar System Ambassador program and software engineer at Cisco Systems. You can follow him on twitter @rtphokie.
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