Note 18 — MOUNTAIN OBSERVATORIES.
Reading edition
Defined by the tint of the second hydrogen-line, the bright reversal of Fraunhofer’s F. The sun would also seem—adopting a medium estimate—three or four times as brilliant as he now does.
Reading edition
Defined by the tint of the second hydrogen-line, the bright reversal of Fraunhofer’s F. The sun would also seem—adopting a medium estimate—three or four times as brilliant as he now does.