| Astronomical Supplement to the Astronomical Almanac | |
|---|---|
| Astronomical Supplement to the Astronomical Almanac | The specification for the Eastern Time Zone is set forth at 49 CFR 71 |
| The boundary between Eastern and Central is set forth at 49 CFR 71 | Astronomical Almanac Online 2015, Glossary s |
|---|---|
| Patton, Jessica 7 October 2020 | 5, and is listed in and formats |