Table 1.
Records of auroral observations on February 15, 1730.
| ID | Year | Month | Date | Colour | Direction | Start | End | G. Lat. | G. Long. | MLAT |
|---|---|---|---|---|---|---|---|---|---|---|
| C1 | 1730 | 2 | 15 | R | N37° 29′ | E121° 16′ | 28.2 | |||
| C2 | 1730 | 2 | 15 | Pu | en | N43° 36′ | E093° 02′ | 35.7 | ||
| C3 | 1730 | 2 | 15 | R | n | 22:00 | 26:00 | N39° 20′ | E112° 26′ | 30.3 |
| C4 | 1730 | 2 | 15 | R | n | 22:00 | 26:00 | N39° 20′ | E112° 26′ | 30.3 |
| C5 | 1730 | 2 | 15 | R | n | 22:00 | 26:00 | N39° 02′ | E114° 04′ | 30.0 |
| C6 | 1730 | 2 | 15 | FC | 22:00 | N37° 23′ | E121° 36′ | 28.1 | ||
| C7 | 1730 | 2 | 15 | R | N37° 29′ | E121° 16′ | 28.2 | |||
| C7 | 1730 | 2 | 15 | FC | 22:00 | N37° 23′ | E121° 36′ | 28.1 | ||
| J1 | 1730 | 2 | 15 | e-n | N36° 34′ | E136° 39′ | 27.4 | |||
| J2 | 1730 | 2 | 15 | Gl | wn | N40° 36′ | E140° 28′ | 31.5 | ||
| J3 | 1730 | 2 | 15 | Gl | wn | N40° 36′ | E140° 28′ | 31.5 | ||
| J4 | 1730 | 2 | 15 | R | wn-en | 20:00 | 28:00 | N36° 34′ | E136° 39′ | 27.4 |
| J5 | 1730 | 2 | 15 | R | N37° 21′ | E137° 04′ | 28.2 | |||
| J6 | 1730 | 2 | 15 | R | 22:00 | 26:00 | N39° 23′ | E141° 07′ | 30.3 | |
| J7 | 1730 | 2 | 15 | R-W | wn-en | 22:00 | 26:00 | N39° 23′ | E141° 07′ | 30.3 |
| J8 | 1730 | 2 | 15 | daytime | night | N40° 36′ | E140° 28′ | 31.5 | ||
| J9 | 1730 | 2 | 15 | R | en-w | 28:00 | N36° 34′ | E136° 39′ | 27.4 | |
| J10 | 1730 | 2 | 15 | e-n | N36° 34′ | E136° 39′ | 27.4 | |||
| J11 | 1730 | 2 | 15 | n | 22:00 | N36° 34′ | E136° 39′ | 27.4 | ||
| J12 | 1730 | 2 | 15 | R | 22:00 | 28:00 | N38° 02′ | E138° 22′ | 28.9 | |
| J13 | 1730 | 2 | 15 | R-W | e-w | 22:00 | N39° 43′ | E140° 07′ | 30.6 | |
| J13 | 1730 | 2 | 15 | s | N40° 36′ | E140° 28′ | 31.5 | |||
| J14 | 1730 | 2 | 15 | Gl | wn | N40° 36′ | E140° 28′ | 31.5 | ||
| J15 | 1730 | 2 | 15 | Gl | wn | N40° 36′ | E140° 28′ | 31.5 | ||
| J16 | 1730 | 2 | 15 | en | N36° 34′ | E136° 39′ | 27.4 | |||
| J17 | 1730 | 2 | 15 | R | wn-en | 20:00 | 28:00 | N36° 34′ | E136° 39′ | 27.4 |
| J18 | 1730 | 2 | 15 | n | 20:00 | dawn | N38° 13′ | E139° 29′ | 29.1 | |
| J19 | 1730 | 2 | 15 | wn | 20:00 | N39° 43′ | E140° 07′ | 30.6 | ||
| J19 | 1730 | 2 | 15 | s | N40° 36′ | E140° 28′ | 31.5 | |||
| J20 | 1730 | 2 | 15 | R | wn-n | N38° 09′ | E140° 16′ | 29.1 | ||
| J21 | 1730 | 2 | 15 | R-W | e-n | 20:00 | 29:00 | N37° 27′ | E137° 16′ | 28.3 |
| J22 | 1730 | 2 | 15 | n-nne | 26:00 | dawn | N34° 59′ | E135° 47′ | 25.8 |
Notes. The colour is described as R (red), W (white), Pu (purple), Gl (golden), or FC (five colours) in these historical documents. The direction is given by the eight points of the compass. Their observational time is given from 06:00 to 30:00 (06:00 on the following day) and time beyond the midnight is given as local time + 24 on the same day, in order to categorise the observations that lasted beyond midnight in the same record. Their source documents are shown in the Appendix A.
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