Original: The very evening of the day of receipt of Le Verrier's letter on September 23, 1846, Neptune was discovered within 1 ° of where Le Verrier had predicted it to be, and about 12 ° from Adams' prediction.
Simplified: Neptune was then discovered that very night on September 23, 1846, within 1 ° of where Le Verrier had predicted it to be, and about 10 ° from Adams' prediction.