The phrase "a certain point during" is correct and usable in written English.
It can be used to refer to a specific moment or stage within a particular timeframe or event.
Example: "At a certain point during the meeting, we realized we needed to change our strategy."
Alternatives: "a specific moment during" or "an unspecified time during".
At a certain point during a negotiauction, the seller pits potential buyers against one another in an auction.
At a certain point during an Elisa Monte Dance concert one piece begins to blur into the next.
At a certain point during the show, he is heard to declare: "I would like to give the answer".
I have found that at a certain point during the day all of a sudden things happen -- muscles just don't hold in?
It's just that, at a certain point during an evening of his work, the eyes begin to glaze under the inexorable onslaught of shapely thighs and chiseled torsos.
I can't say how many takes it took, but at a certain point during one of them, I looked away from the monitors and around the kitchen.
ODt0 is the initial optical density before starting the flocculation and ODt1 is the optical density of the sample at a certain point of time during the process.
Some of the results are shown in Fig. 2 which presents an example of the TEC variation at a certain point (37°N, 127°E) during 10 geomagnetically quiet days with Kp less than 4 in November 2003.
"Part of the reason I think that the storyline is that [lawmakers] haven't done much is because, in part, the president and others have set these early timelines about things need to be done by a certain point," he said during Monday remarks to a Rotary Club in Kentucky. .
We see that the real part of these eigenvalue pairs become equal at a certain point in time during the initial transient).
In the case of the R-phase to B19′ transformation large strains occur causing after a certain point fine compound twinning during growth that finally leads to a complete transformation right up to the interface.
