Cosmic tuning fork "MOON"
Material thickness 8 mm
| No. | Designation | Frequency in Hertz |
|---|---|---|
| AB-620 | Moon culmination | 187,61 |
| AB-625 | Synodic moon | 210,42 |
| AB-628 | Sideric moon | 227,43 |
Material thickness 8 mm
| No. | Designation | Frequency in Hertz |
|---|---|---|
| AB-629 | Metonic cycle | 229,22 |
| AB-630 | Moon knot | 234,16 |
Material thickness 8 mm
| No. | Designation | Frequency in Hertz |
|---|---|---|
| AB-631 | Saros period | 241,56 |
| AB-632 | Apsidis rotation | 246,04 |