On this day, in 1904, the first permanently mounted solar telescope sees its first light. George Hale, the founder of Mount Wilson Observatory, in California, realised the need for a large spectrograph for the spectrum of the Sun to be studied in detail. Donated by Helen Snow to the Yerkes Observatory, in Wisconsin, the Snow Telescope was brought to Mount Wilson by mules and horses in 60 separate trips. In addition to the study of solar sunspots, the Sun’s rotation and other features of our star, the Snow solar telescope was also used to the study of other stars, namely red supergiants.