30 April 2017
- 17:4417:44, 30 April 2017 diff hist −121 Zane Middle School sundial →Calculations
- 17:4017:40, 30 April 2017 diff hist +416 Zane Middle School sundial →How to Use it
- 17:3917:39, 30 April 2017 diff hist +50 Zane Middle School sundial →References
- 17:3417:34, 30 April 2017 diff hist +529 Zane Middle School sundial →Calculations