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included a good three-inch lens for concentrating
the sun’s rays, and the night was sufficiently clear
to enable me to burn holes in hats and other dark
garments at about midnight. These, of course,
were retained as trophies.
The following programme of the midnight sun
may be useful to those who contemplate a visit to
Arctic Norway, and like ourselves find it difficult
to leave England before midsummer. A free
northern horizon is here assumed, but this is not
always attainable. In its absence a hill somewhat
exceeding the height of the obstructions on the
horizon must be ascended. I say somewhat exceeding,
because the refraction which renders the
sun visible for some time after it has actually sunk
below the horizontal line is diminished as we
ascend. The figures below include the effect of
refraction at the sea level.
| Bodö, 67° 17′. | Tromsö. 69° 39′. | Vardö. 70° 22′. | Hammerfest. 70° 40′. | North Cape, 71° 15′. | |
| Upper limit of sun | May 31 to July 8. | May 18 to July 22. | May 14 to July 26. | May 13 to July 27. | May 11 to July 30. |
| Middle or half sun | June 2 to July 10. | May 19 to July 24. | May 16 to July 27. | May 14 to July 28. | May 12 to July 31. |
| Whole sun | June 4 to July 12. | May 20 to July 25. | May 17 to July 28. | May 15 to July 29. | May 13 to August 1. |
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