The Talmud (Brachot 59b) teaches:
He who sees the sun at its season, the moon at its strength, the stars in their paths, and the constellations in their order, recites "Blessed is the One Who performs the act of creation." And when does this happen? Abaye says: Every 28 years, when the cycle returns and the season of Nissan falls in Saturn, on the fourth day of the week.
On April 8, 2009, the eve of Passover, Jews around the world will rise early, gaze at the sun and recite the least-frequently-recited blessing in Judaism: Birkat HaChama, the blessing on the sun. We recite this blessing once every 28 years, and it's coming to your neighborhood very soon. Assuming, of course, that the sun rises that fateful Wednesday the same way it has every day until now...
How-to
Ideally, one should recite the blessing as early as possible, and with as large a group as possible. Practically speaking, this means that people will get up early and pray Shacharit right at sunrise, and immediately after recite the blessing:
Baruch atah Adonai Eloheinu Melech ha Olam,oshea ma'aseh vereishit.(blessed are you Lord G-d
king of the universe who performs the act of creation.
Preferably, the blessing should be said by the third hour of the day. Adjusting for daylight savings time, this time is 9:42 a.m. in New York City, and 9:30 a.m. in Jerusalem. If necessary, the blessing can still be said up until midday (12:57 p.m. in New York and 12:41 in Jerusalem).
The blessing should be said where you can see the ball of the sun, or at least the silhouette of the sun behind a cloud. If it is a cloudy day and you cannot see the sun, you should say the blessing without including God's holy name.
According to the Mishnah Berurah (229:8), there are a number of other prayers to say that morning, in the following order:
1. Psalm 148
2. The blessing of "Oseh Ma'aseh Breishit"
3. "Kel Adone..." until "Chayot Hakodesh" (part of the first blessing of Shema on Shabbat morning)
4. Psalm 19
5. "Aleynu"
6. Kaddish (in the presence of a minyan)