The phrase "as it gradually" is correct and usable in written English.
You can use it to describe a process or change that occurs slowly over time.
Example: "The temperature increased as it gradually warmed up throughout the day."
Alternatives: "as it slowly" or "as it progressively".
The highway intersects unsigned MD 995 (Amtrak Way), which leads to the BWI Rail Station, as it gradually curves to the east.
Work on building the temple started before the gates opened but anyone could participate in its construction as it gradually achieved its final form in the course of the week-long festival.
The area's decline began in the 1950s as it gradually lost its middle class and businesses started to close.
Meanwhile, the fund's fundamentals deteriorated as it gradually accounted for its huge losses in the stock market crash.
"Even if it's completely overcast, there are plenty of other chances to see the moon as it gradually moves past its full phase over the next few nights, so don't be disheartened.
Accordingly, the spin-coated nanosilver colloidal layer began to be dewetted and agglomerate as it gradually solidified from its wet state under various annealing conditions.
Farmers will lease space from CIM Group as it gradually moves to its new quarters.
As it gradually gains more worldwide acceptance, a clarification of its mechanisms is extremely urgent.
Plants absorb much of this through their roots, and some makes its way down to the water table, being purified as it gradually percolates through the soil.
I hope that I get more clear nights this month to shoot the comet, as it gradually moves away from the earth and the sun on its big lap of our solar system.
Yet the truth, as it gradually emerged last week, was very different.
