The album's title derives from TSHA's astrological sign.[5] She explained, "I like to identify with some of the positive characteristics of a Capricorn: the hardiness and the work ethic... but also the sensitivity."[6]
According to the review aggregator Metacritic, Capricorn Sun received "universal acclaim" based on a weighted average score of 81 out of 100 from 4 critic scores.[7]
Ben Cardew of Pitchfork commented that "TSHA casually throws house, UK garage, R&B, pop, and breakbeats into the mix, in keeping with the relaxed dilettantism currently heard across much modern dance music."[11] Ana Lamond of Clash described the album as "a pop-focussed listen that wholly embraces its vocal elements as a driving force, urging its crowds to join along, all as one."[9] Paul Simpson of AllMusic stated, "While generally sunny and celebratory, the album is shaded with feelings of heartache and anxiety, inspired by personal issues, friends and family members, and club closure due to pandemic lockdown."[8] He added, "Well-sequenced and brimming with heartfelt energy, Capricorn Sun is an inspired effort."[8]