Calypso
3 of the 6 encyclopedias on this shelf carry an entry for Calypso. All 3 are reproduced below, so you can see where they agree and where they differ.
Aiton's Encyclopedia (1910)
ka-lip'so, in Greek mythology, a sea nymph. She was variously said to be the daughter of Atlas, of Nereus, and of Oceanus. She dwelt alone on the wooded island Ogygia, remote from both gods and men. During his wanderings after the Trojan War, Ulysses reached this island. He was hospitably received by the nymph, who straightway fell in love with him and strove by every art she knew to keep him from leaving her. She promised him perpetual youth and immortality. For seven years she was successful in holding the recreant. Then Zeus interfered and commanded Calypso to send Ulysses on his way. Having fitted him out with a raft, provisions, and a breeze to waft him on, she sorrowfully bade him farewell. Later, when Telemachus, son of Ulysses, went in search of his father, he, too, stopped at Calypso's isle. Again Calypso tried to hold her guest, but Minerva, who, disguised as Mentor, accompanied Telemachus, influenced him to withstand Calypso's allurements. The two escaped from the island by jumping from a cliff into the sea and swimming to a ship which lay becalmed at a little distance.
1000 Classical Characters (1900)
One of the Oceanides, or one of the daughters of Atlas according to some writers. When Ulysses was shipwrecked on her coasts she received him with hospitality, and offered him immortality if he would remain with her as a husband, which he refused to do, and after seven years' delay he was permitted to depart from the island where Calypso reigned.
Collier's New Encyclopedia (1921)
in Grecian legend, was, according to Homer, the daughter of Atlas, and inhabited the solitary wooded isle of Ogygia, far apart from all gods Ulysses being thrown upon and men. her island by shipwreck, she treated him. kindly, and promised him immortality if he would marry her.
What Has Changed in the Last Century
Nothing in Homer has changed since these entries appeared, and the story of the nymph who kept Ulysses seven years on Ogygia and offered him immortality reads today exactly as it did in 1900, 1910 and 1921. One correction is worth making: the elaborate episode Aiton's gives in 1910, in which Telemachus visits the island and escapes with Minerva-as-Mentor by leaping from a cliff, is not Greek myth at all but an invention of Fenelon's 1699 French novel Telemaque, which was then still a schoolroom staple and was often absorbed into reference works as though it were ancient. Since 1921 the chief additions are external: a small moon of Saturn was named Calypso after its discovery in 1980, and modern readers, following translations such as Emily Wilson's Odyssey of 2017, tend to dwell on the detail these entries pass over, that Odysseus wept on the shore and stayed unwillingly.
Written for this edition, 2026.