RS Oph in 1907. The peak of the 1907 eruption was not seen (due to the usual solar gap), but RS Oph was a magnitude fainter
than its quiescent brightness for 148 days. This dip is highly significant, substantially fainter than the normal quiescent
level, and completely unprecedented other than immediately after an eruption. An easy and persuasive conclusion is that RS
Oph had an eruption in 1907 with its peak lost in the solar glare, only to have the usual post-eruption dip producing the
fading seen in the Harvard plates.