In her book “Cosmology and Eschatology in Jewish and Christian Apoocalypticism” Adela Yarbro Collins wrote referring to Daniel chapter 8:
Denis O. Lamoureux is the author of “Lessons from the Heavens: On Scripture, Science and Inerrancy.” [Perspectives on Science and Christian Faith, Volume 59, Number 1, March 2007.]
The article focuses upon concordism as an interpretive approach to biblical cosmology in contrast to what he calls a modern phenomenological perspective. Lamoureux included the following discussion of the firmament:
The scientific revolution in astronomy that occurred about 1750 AD fulfilled the prophecy of Daniel 8:13-14, when an angelic messenger or saint answered the question, “How long shall be the vision concerning the tamiyd [continual] and the transgression of desolation, to give both the sanctuary and the host to be trodden under foot?” The answer came: “And he said unto me, Unto two thousand and three hundred days; then shall the sanctuary be cleansed.” Read more…
The prophecy of the 2,300 days in Daniel 8:14 outlines the history of the geocentric cosmology of the hellenistic age, which became prominent in the centuries after Daniel, and persisted for 23 centuries after Daniel’s vision.
In the image below the 70 weeks prophecy of Daniel 9:24-27 and the 2,300 days of Daniel 8:14 are compared.
The following is Leroy Froom’s account of Nicolas of Cusa and his investigations on the prophecy of 2,300 days in Daniel 8:14.
In the Olivet Discourse where Jesus responds to the question about the sign of his coming and the end of the age, Jesus focused upon seeing the abomination of desolation mentioned in the prophecies of Daniel. Scholars have long debated what he meant. In Daniel chapter 8, a prophecy is described that refers to 2,300 days, and its meaning would only be understood at the “time of the end.” [Dan. 8:17] When Jesus referred to one of the prophecies of Daniel in connection with the “sign” of the end time, he must have meant that when Daniel’s prophecies are understood, that would be the sign of his coming that the disciples requested.