| Observatory observation, perhaps | 32 |
| Observatory observation | 23 |
| Observatory near San Diego | 26 |
| Observatory NE of San Diego | 27 |
| Observatory function | 20 |
| Observatory find | 16 |
| Observatory explosions | 22 |
| Observatory doings | 18 |
| Observatories do it | 19 |
| Observations | 12 |
| Observational | 13 |
| Observation: Part 4 | 19 |
| Observation: Part 3 | 19 |
| Observation: Part 2 | 19 |
| Observation: Part 1 | 19 |
| Observation, part 6 | 19 |
| Observation, part 5 | 19 |
| Observation, Part 4 | 19 |
| Observation, Part 3 | 19 |
| Observation, Part 2 | 19 |
| Observation, part 1 | 19 |
| Observation, final part | 23 |
| Observation while passing the buck | 34 |
| Observation spot for tourists | 29 |
| Observation re candidates? | 26 |
| Observation posts for Peeping Toms | 34 |
| Observation on the ad era | 25 |
| Observation of cardinals, say | 29 |
| Observation from Bill Cosby, part 1 | 35 |
| Observation by Gibran | 21 |
| Observation by Davidson | 23 |
| Observation balloon | 19 |
| Observation as to why a Kansas-based company has to relocate to San Francisco instead of Boston? | 96 |
| Observation after too many wrong turns | 38 |
| Observation after a Bush walk? | 30 |
| Observation after "Clean your room!" | 46 |
| Observation about sprouting aromatic plants? | 44 |
| Observation about Las Vegas? | 28 |
| Observation (Part 4) | 20 |
| Observation (Part 3) | 20 |
| Observation (Part 2) | 20 |
| Observation | 11 |
| Observant type | 14 |
| Observant person | 16 |
| Observant people, say | 21 |
| Observant people | 16 |
| Observant ones | 14 |
| Observant one | 13 |
| Observant Muslim, at times | 26 |
| Observant Mormons, e.g. | 23 |
| Observant individual | 20 |
| Observant hobbyist | 18 |
| Observant folks | 15 |
| Observant | 9 |
| Observances of the law | 22 |
| Observances | 11 |
| Observance through Oct. | 23 |
| Observance prescribed in the Book of Esther | 43 |
| Observance one week before Easter | 33 |
| Observance on the 40th day after Easter | 39 |
| Observance of moral law | 23 |
| Observance of correctness | 25 |
| Observance of 1976 | 18 |
| Observance made official by President Wilson in 1914 | 52 |
| Observance given its current name in 1954 | 41 |
| Observance before Easter | 24 |
| Observance 'shuffled' in this puzzle | 44 |
| Observance | 10 |
| Observably ashamed | 18 |
| Observable | 10 |
| Obsequy song | 12 |
| Obsequious sort | 15 |
| Obsequious person | 17 |
| Obsequious one | 14 |
| Obsequious group | 16 |
| Obsequious gesture | 18 |
| Obsequious flattery | 19 |
| Obsequious flatterer | 20 |
| Obsequious Dickens character | 28 |
| Obsequious answers | 18 |
| Obsequious | 10 |
| Obsequies | 9 |
| Obsecrate | 9 |
| Obscurity | 9 |
| Obscurities | 11 |
| Obscuring rays (5) | 18 |
| Obscuring hazes | 15 |
| Obscuring cloud | 15 |
| Obscuring atmospheres | 21 |
| Obscures, with "up" | 29 |
| Obscures, to the Bard | 21 |
| Obscures, in a way, with "up" | 39 |
| Obscures fully | 14 |
| Obscures | 8 |
| Obscurer of trees, for some | 27 |
| Obscurer of Dorothy's dog? | 30 |
| Obscured, with "out" | 30 |
| Obscured by haze | 16 |
| Obscured | 8 |
| Obscure, as vision | 18 |