No. Alarms ring from this page, so keep it open; a pinned tab works well. They're saved in this browser, so they're waiting for you when you come back.

Browsers don't let a page make sound until you've tapped or clicked it once. Any tap does it, and after that your alarms can play even when you're in another tab.

Yes, while the page is open and the screen is on. Phones often pause pages when the screen locks, so use Night watch, which keeps the screen awake, and leave the phone plugged in.

They're played live in your browser, not recorded. The sistrum was the sacred bronze rattle of the goddess Hathor. Arched harps appear in tomb paintings. The ney, an end-blown reed flute, has been played in Egypt for thousands of years. The fanfare echoes the two trumpets found in Tutankhamun's tomb. The drums play the maqsum, a rhythm still heard across Egypt, and the melodies use Hijaz, a mode of Egyptian music today: nobody knows exactly how ancient Egyptian music sounded.

Egyptian numerals repeat signs: a stroke for each 1 and a hobble for cattle, shaped like an arch, for each 10, so 37 is three arches and seven strokes. There was no zero digit, so 00 is shown with 𓄤, nefer, a sign scribes and builders used for a zero balance or a base level.

The Coptic calendar, the living descendant of the ancient Egyptian civil calendar: twelve months of thirty days, then five extra days (six in leap years). Its months fall in the three seasons of the Nile: Akhet, the flood; Peret, the growing; and Shemu, the harvest. The extra days were kept as the birthdays of Osiris, Horus, Set, Isis and Nephthys.

The Egyptians split the daylight into twelve hours and the night into twelve more, which is where our 24 hours ultimately come from. Their hours stretched and shrank with the seasons; here the day simply runs from 6 in the morning to 6 in the evening.

The scene follows your clock. The sun rises on the left at 6 and sets on the right at 6, and at night the moon shows its real phase. The Anubis scene is always night: the Duat, the underworld the sun sailed through between sunset and dawn.