| Monthly Free Star Party |
Centennial Observatory |
Saturday, April 11, 2026 |
8:45-10:45 p.m. |
Free |
| International Astronomy Day Solar Viewing |
Centennial Observatory |
Saturday, April 25, 2026 |
11:00 a.m.-4:00 p.m. |
Free |
| International Astronomy Day Star Party |
Centennial Observatory |
Saturday, April 25, 2026 |
9:00-11:00 p.m. |
Free |
| Monthly Free Star Party |
Centennial Observatory |
Saturday, May 9, 2026 |
9:30-11:30 p.m. |
Free |
| Summer Solar Session #1 |
Centennial Observatory |
Wednesday, May 27, 2026 |
1:30-3:30 p.m. |
Free |
| Summer Solar Session #2 |
Centennial Observatory |
Wednesday, June 3, 2026 |
1:30-3:30 p.m. |
Free |
| Best evening apparition of Mercury in 2026 & Venus-Jupiter conjunction |
Centennial Observatory |
Tuesday, June 9, 2026 |
9:15-9:30 p.m. |
Free |
| Summer Solar Session #3 |
Centennial Observatory |
Wednesday, June 10, 2026 |
1:30-3:30 p.m. |
Free |
| Monthly Free Star Party |
Centennial Observatory |
Saturday, June 13, 2026 |
9:45-11:45 p.m. |
Free |
| Summer Solar Session #4 & close Moon-Venus conjunction |
Centennial Observatory |
Wednesday, June 17, 2026 |
1:30-3:30 p.m. |
Free |
| Summer Solar Session #5 |
Centennial Observatory |
Wednesday, June 24, 2026 |
1:30-3:30 p.m. |
Free |
| International Asteroid Day Festival |
Centennial Observatory |
Saturday, June 27, 2026 |
1:00-5:00 p.m. |
Free |
| Summer Solar Session #6 |
Centennial Observatory |
Wednesday, July 1, 2026 |
1:30-3:30 p.m. |
Free |
| Close Conjunction of Mars and Uranus |
Centennial Observatory |
Saturday, July 4, 2026 |
5:00-5:30 a.m. |
Free |
| Summer Solar Session #7 |
Centennial Observatory |
Wednesday, July 8, 2026 |
1:30-3:30 p.m. |
Free |
| Monthly Free Star Party |
Centennial Observatory |
Saturday, July 11, 2026 |
9:45-11:45 p.m. |
Free |
| Summer Solar Session #8 |
Centennial Observatory |
Wednesday, July 15, 2026 |
1:30-3:30 p.m. |
Free |
| Annual Castle Rocks Star Party solar viewing |
Castle Rocks Visitor Center, Almo, Idaho |
Friday, July 17 & Saturday, July 18, 2026 |
12:00-5:00 p.m. |
Free |
| Annual Castle Rocks Star Party telescope viewing |
The Lodge, Castle Rocks State Park |
Friday, July 17 & Saturday, July 18, 2026 |
Starting at 9:30 p.m. |
Free (park use fees apply) |
| Summer Solar Session #9 |
Centennial Observatory |
Wednesday, July 22, 2026 |
1:30-3:30 p.m. |
Free |
| Peak Pluto in 2026 |
Centennial Observatory |
Friday, July 24, 2026 |
1:45-2:15 a.m. |
Free |
| Summer Solar Session #10 |
Centennial Observatory |
Wednesday, July 29, 2026 |
1:30-3:30 p.m. |
Free |
| Summer Solar Session #11 |
Centennial Observatory |
Wednesday, August 5, 2026 |
1:30-3:30 p.m. |
Free |
| Monthly Free Star Party |
Centennial Observatory |
Saturday, August 8, 2026 |
9:45-11:45 p.m. |
Free |
| Summer Solar Session #12 |
Centennial Observatory |
Wednesday, August 12, 2026 |
1:30-3:30 p.m. |
Free |
| Summer Solar Session #13 |
Centennial Observatory |
Wednesday, August 19, 2026 |
1:30-3:30 p.m. |
Free |
| Summer Solar Session #14 |
Centennial Observatory |
Wednesday, August 26, 2026 |
1:30-3:30 p.m. |
Free |
| Deep partial lunar eclipse |
Centennial Observatory |
Tuesday, August 28, 2026 |
8:00 p.m.-12:00 a.m. |
Free |
| Monthly Free Star Party |
Centennial Observatory |
Saturday, September 12, 2026 |
8:45-10:45 p.m. |
Free |
| International Observe the Moon Night |
Centennial Observatory |
Saturday, September 19, 2026 |
8:30-9:30 p.m. |
Free |
| Closest approach of Saturn in 2026 |
Centennial Observatory |
Sunday, October 4, 2026 |
1:15-1:45 a.m. |
Free |
| Monthly Free Star Party |
Centennial Observatory |
Saturday, October 10, 2026 |
8:00-10:00 p.m. |
Free |
| Telescope Tuesday |
Centennial Observatory |
Tuesday, November 10, 2026 |
6:15-9:00 p.m. |
$1.50, ages 6 & under free, or free with planetarium admission |
| Monthly Free Star Party |
Centennial Observatory |
Saturday, November 14, 2026 |
6:15-9:00 p.m. |
Free |
| Best morning apparition of Mercury in 2026 |
Centennial Observatory |
Thursday, November 19, 2026 |
7:15-7:30 a.m. |
Free |
| Telescope Tuesday |
Centennial Observatory |
Tuesday, November 24, 2026 |
6:15-9:00 p.m. |
$1.50, ages 6 & under free, or free with planetarium admission |
| Telescope Tuesday |
Centennial Observatory |
Tuesday, December 8, 2026 |
6:00-9:00 p.m. |
$1.50, ages 6 & under free, or free with planetarium admission |
| Monthly Free Star Party |
Centennial Observatory |
Saturday, December 12, 2026 |
6:00-9:00 p.m. |
Free |
| Telescope Tuesday |
Centennial Observatory |
Tuesday, December 22, 2026 |
6:00-9:00 p.m. |
$1.50, ages 6 & under free, or free with planetarium admission |