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Mercury is in the western sky about 30 minutes after sunset. Mercury moves from the constellation of Gemini, and it's usually Mercury is in the constellation of Gemini, shining at magnitude 0.5 on the 16th. Quick tutorial on the magnitude, the magnitude scale is in first, about larger than the magnitude scale, meaning that as the magnitude is in three, the apparent brightness of the object decreases by a factor of about 2.5. The dimness object that the human eye can see under optimal conditions is about 6th magnitude. So any magnitude greater than 6th, you will definitely need for an octal or a telescope to spot any magnitude less than 6th. You should be able to spot with the naked eye. But quite those telescopes and monoculars towards those right.