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For inner planets (Venus and Mercury) the best time for observation is west or east elongation. During east elongation (planet can be seen in the evening) the planet is located "in front" of the Sun in the sky. The planet is seen the best in winter and spring because the Sun's declination is increasing and the planet gets to be before Sun, in place ...


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You were close! The difference changes when the Julian calendar has a leap day which the Gregorian calendar doesn't: 2100-02-29 old style or 2100-03-14 new style.


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