Prognosticator

Plenty of prognosticators try to forecast the ups and downs of the market.

Source: wiktionary

Thou art wearied in the multitude of thy counsels: let now the astrologers, the starre-gazers, the monethly prognosticators stand vp, and saue thee from these things that shall come vpon thee.

Source: wiktionary

When the staccato, Neptunes-ian single “Boyfriend” was released in March, musical prognosticators were quick to peg the album it portended, Believe, as Justin Bieber’s Justified, a grown-and-sexy, R&B-centric departure that evolved millennial teenybopper Justin Timberlake into one of the unifying pop-music figures of the aughts.

Source: wiktionary

On Long Bets, a website where prognosticators test their mettle by playing for real (or at least proceeds-donated-to-charity) stakes, there is an open bet between the British astrophysicist Martin Rees, a noted worrier over apocalyptic possibilities, and Harvard University’s Steven Pinker, famous for his vaulting optimism.

Source: wiktionary