India, March 25 -- On March 29, early risers in the northeastern United States will witness a unique sight. A partial solar eclipse will have started by the time the sun rises. The moon's shadow will produce a rare "double sunrise" effect in some areas.

The opportunity to witness the uncommon phenomena of "solar horns," in which the cusps of an eclipsed crescent sun appear as two distinct points above the horizon before sunrise, is available to North Americans who are in the right spot at the right time and who have clear skies.

Choosing the best spot is essential for watchers in the northeastern United States and eastern Canada hoping to see this uncommon occurrence.

Thirteen states will be able to see the eclipse, with New England pr...