D & R, pp. 323-325:
“The 1290 Prophetic Days. — We have here a new prophetic period introduced
[compared to the 1260 days], 1290 prophetic days, which according to Bible authority would denote the same number of literal years. From the reading of the text, some have inferred that this period begins with the setting up of the abomination of desolation, or the papal power, in A. D. 538, and consequently extends to 1828. We find nothing in the latter year [1828] to mark its termination, but we do find evidence in the margin that it begins before the setting up of the papal abomination. The margin reads, ‘To set up the abomination.’ With this reading the text would stand thus: “From the time that the daily sacrifice shall be taken away to set up [or, in order to set up] the abomination that maketh desolate, there shall be a thousand two hundred and ninety days.’