1AM, the eighth hour of the night on a Sunday, belongs to Jupiter. Jupiter's hours were kept for expansion, prosperity and lawful authority: petitions to patrons, contracts favoring growth, healing, and honors sought through proper channels. The grimoire tradition reads Jupiter as temperate and benefic, the planet of increase, and its hour was favored for anything meant to flourish rather than merely endure. Practitioners were counseled to match the work to the hour wherever the two could be arranged together, choosing an hour whose ruling planet suited the operation in hand rather than acting in whatever hour happened to be free; a working that fit its planet well was held to draw strength from the hour, while one that fought the ruling planet's nature was held to labor against it.
Because the same planet returns roughly every seventh hour through the whole day, Jupiter also rules 11AM and 6PM elsewhere on this reference Sunday, so a practitioner without access to 1AM specifically could look to those instead for work of the same character. The hour sits inside a wider correspondence system built around the same seven planets: Jupiter is paired with the metal tin, with blue, and with Thursday, the weekday carrying its name in full as well as its first hour. A working timed to 1AM was traditionally strengthened further by choosing Thursday itself and by using that metal and color in the object the working required, and the same logic timed ordinary practical acts as well as ritual, from gathering herbs held sacred to a planet to medical treatments believed to answer best to its temperament.