The circle motif is included for two possible reasons. The more supported reason being, Donne is consoling his wife Anne More by saying that he will leave on these voyages, but he will always return home making a perfect circle. The second speculated reason being that More was pregnant during the time this poem was written. This is likely to be turn because within their relationship the couple had at least 12 children. Anne being pregnant could also explain why she is so emotional about Donne leaving.

beneath the moon