490 days is 70 weeks.
70 weeks are determined upon the people of Jerusalem, before the man of sin is to be revealed sitting in the temple of God, and when the man of sin does come, he will confirm the covenant with many for one week. 69 weeks + 1 week = 70 weeks.
24 Seventy weeks are determined upon thy people and upon thy holy city, to finish the transgression, and to make an end of sins, and to make reconciliation for iniquity, and to bring in everlasting righteousness, and to seal up the vision and prophecy, and to anoint the most Holy.
25 Know therefore and understand, that from the going forth of the commandment to restore and to build Jerusalem unto the Messiah the Prince shall be seven weeks, and threescore and two weeks: the street shall be built again, and the wall, even in troublous times.
26 And after threescore and two weeks shall Messiah be cut off, but not for himself: and the people of the prince that shall come shall destroy the city and the sanctuary; and the end thereof shall be with a flood, and unto the end of the war desolations are determined.
27 And he shall confirm the covenant with many for one week: and in the midst of the week he shall cause the sacrifice and the oblation to cease, and for the overspreading of abominations he shall make it desolate, even until the consummation, and that determined shall be poured upon the desolate.
Luke 19:41-44 KJV
41 And when he was come near, he beheld the city, and wept over it,
42 Saying, If thou hadst known, even thou, at least in this thy day, the things which belong unto thy peace! but now they are hid from thine eyes.
43 For the days shall come upon thee, that thine enemies shall cast a trench about thee, and compass thee round, and keep thee in on every side,
44 And shall lay thee even with the ground, and thy children within thee; and they shall not leave in thee one stone upon another; because thou knewest not the time of thy visitation.
20 And when ye shall see Jerusalem compassed with armies, then know that the desolation thereof is nigh.
21 Then let them which are in Judea flee to the mountains; and let them which are in the midst of it depart out; and let not them that are in the countries enter thereinto.
22 For these be the days of vengeance, that all things which are written may be fulfilled.
Ezekiel 13:1-16 KJV
1 And the word of the Lord came unto me, saying,
2 Son of man, prophesy against the prophets of Israel that prophesy, and say thou unto them that prophesy out of their own hearts, Hear ye the word of the Lord;
3 Thus saith the Lord God; Woe unto the foolish prophets, that follow their own spirit, and have seen nothing!
4 O Israel, thy prophets are like the foxes in the deserts.
5 Ye have not gone up into the gaps, neither made up the hedge for the house of Israel to stand in the battle in the day of the Lord.
6 They have seen vanity and lying divination, saying, The Lord saith: and the Lord hath not sent them: and they have made others to hope that they would confirm the word.
7 Have ye not seen a vain vision, and have ye not spoken a lying divination, whereas ye say, The Lord saith it; albeit I have not spoken?
8 Therefore thus saith the Lord God; Because ye have spoken vanity, and seen lies, therefore, behold, I am against you, saith the Lord God.
9 And mine hand shall be upon the prophets that see vanity, and that divine lies: they shall not be in the assembly of my people, neither shall they be written in the writing of the house of Israel, neither shall they enter into the land of Israel; and ye shall know that I am the Lord God.
10 Because, even because they have seduced my people, saying, Peace; and there was no peace; and one built up a wall, and, lo, others daubed it with untempered morter:
11 Say unto them which daub it with untempered morter, that it shall fall: there shall be an overflowing shower; and ye, O great hailstones, shall fall; and a stormy wind shall rend it.
12 Lo, when the wall is fallen, shall it not be said unto you, Where is the daubing wherewith ye have daubed it?
13 Therefore thus saith the Lord God; I will even rend it with a stormy wind in my fury; and there shall be an overflowing shower in mine anger, and great hailstones in my fury to consume it.
14 So will I break down the wall that ye have daubed with untempered morter, and bring it down to the ground, so that the foundation thereof shall be discovered, and it shall fall, and ye shall be consumed in the midst thereof: and ye shall know that I am the Lord.
15 Thus will I accomplish my wrath upon the wall, and upon them that have daubed it with untempered morter, and will say unto you, The wall is no more, neither they that daubed it;16 To wit, the prophets of Israel which prophesy concerning Jerusalem, and which see visions of peace for her, and there is no peace, saith the Lord God.