The radio, wired up to a car battery, crackles into life in the near darkness outside the first house of Kizimbani village, where a small crowd has gathered to listen for the moon. Above us the sky is pitch black, with not even a star visible.
The new moon, if it puts in an appearance tonight, will mean the end of a long hard month of fasting for Zanzibar's predominantly Muslim population. During daylight hours in the lunar month of Ramadan the faithful may not eat, drink, smoke - or have sex. Only the sick, young children and travellers are exempt.
In temperatures that rise to over 90 degrees Fahrenheit in the wavy heat of the afternoons, giving up food and water is no token gesture. From tonight, though, an exhausting twenty-eight days of abstinence is up and the party can begin. Or can it?
If the new moon we're all waiting for chooses to show her face in the blue-black darkness above us, the celebrations for which planning is already well under way will commence first thing in the morning.
Electricity poles are being strung up around fields, girls and women have been pounding red henna leaves and black picco to paint their hands and feet for days now, and every store in town has been full to bursting with last-minute shoppers stocking up on bottles of orange Fanta, cuts of meat, bags of Ugali and starched nylon frocks. The children are worked up to the point of hysteria and the atmosphere of suppressed excitement and anticipation crackles in the hot air.
No moon, however, means that everyone must wait another 24 hours before breaking their fast. Such an important event cannot be left to chance - so not only is everyone on Zanzibar scanning the skies for their own moon, but we're all gathered eagerly around the nearest radio, waiting for the government to announce a new moon sighting above any part of Tanzania or coastal Kenya.
This is the ancient kingdom of the Swahilis, whose modern-day inhabitants still retain the faith brought here by the Arabic races whose fast-sailing dhows once controlled the East African coast and its lucrative slave trade.
As the night wears on it becomes apparent that no moon is to be forthcoming, in Zanzibar or anywhere else. Anticlimax prevails, and another hot, thirsty day goes by before the longed-for sickle appears on cue above the lights of Blues restaurant in the harbour and a cheer goes up from the ragged groups of watchers along the water's edge.
For the next five days and nights, it's time for a party that promises to put the tourists' Millennium celebrations of a week ago firmly in the shade. 'Dancing tonight' says my friend Hisdori mysteriously to me at lunchtime. 'Beer tonight' says his mother, usually the picture of demure matronhood in her kanga and headscarf, but today with a gleam in her eye and freshly painted henna on the palms of her hands.