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Have you ever dug a posthole and set a fence post only to find that you had less dirt left over than would otherwise fill the space the post was now taking up? Why was that? The odds are these lunar expansions and contractions are at work depending on the time of the month you were working. So why not use this to advantage: Dig the posthole during the waxing of the moon, when the soil is expanded and also a bit easier to dig in, and then set the posts at the waning of the moon when the dirt can be more compacted around the post. This results in a sturdier set of the post, which is pretty critical with corner posts or gateposts.