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Discover LudwigThe phrase "a certain longitude" is correct and usable in written English.
It can be used when referring to a specific but unspecified longitude in geographical or navigational contexts.
Example: "The ship was anchored at a certain longitude, waiting for further instructions from the coast guard."
Alternatives: "a specific longitude" or "an unspecified longitude".
Exact(1)
This can be used to forecast the arrival of a bubble at a certain longitude eastward of the detection location, e.g., 750 km eastward after 1.5 hours assuming an average drift speed of 140 m/s.
Similar(58)
Longitudinal variations of hmF2 are so strong and their extrema at certain longitudes are so stable that they are clearly seen even in maps established after averaging a great number of measurements at different times.
The average EEJ current density distribution for noontime conditions derived from CHAMP measurements show large diurnal variations occurring at certain longitudes, example, at 90° W and 90° E (Luhr et al. 2008).
Therefore, this paper proposed a GeoHash algorithm to implement this step: through a certain rule [12, 13], a string to represent the latitude and two longitude coordinates.
However, for a certain environment class, the evolution of μ w and σ w with respect to the longitude does not seem to be consistent, as shown in Figure 12.
— a certain pleasure.
A certain lady.
"To a certain point.
To a certain extent.
A certain attire.
By a certain light.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com