Assertion: planet | /r/AtLocation | same celestial longitude
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text: When two or more planets are listed as being visible at ' Dawn ' or ' Dusk ' in any particular month (e.g. if Mercury , Venus and Mars all appear listed under ' Dusk ' in a single month) they are likely to appear close together in the sky during this time, and planetary conjunctions (when two planets are at the same celestial longitude) are most likely to take place.