'constant day' is not an accurate phrase in written English.
You could use the phrase 'every day' to convey the same meaning. For example, "I go for a walk every day to keep in shape."
A short stress period of two hours was applied to whole plants bearing berries at all reproductive stages from flowering to maturity, following an acclimatization period of ten days at constant day and night temperatures (22/12°C).
And they are constant: day in, day out they will strike the spacecraft and the astronauts inside.
They have the advantage of a constant day length which is probably the most difficult obstacle to overcome at our latitude.
They were constant, day or night.
But it is a constant, day by day, struggle, a long term presence working with a big vision to save the wildlife, to save a precious bit of nature found no where else on Earth but Madagascar.
American voters must not, however, fall into the trap of thinking that Hillary's occasional lies are even remotely on the level of Trump's, which are constant, day after day, hour after hour, on virtually everything.
We have previously demonstrated that the vast majority of suicides in West Greenland are violent and peak in the summer when the Northern half of Greenland has constant day-light and the Southern half has extremely long days [ 2].
"It's the constant day-to-day 'our guy is great and your guy is crap' that can have an influence over time," he said.
There is a constant day-to-day flow of expert advice, whether from Science Advisory Councils and Committees, via the Research Councils or the National Academies, or through the Government Science and Engineering network.
I have to pace myself and keep the big decisions in mind, because you can't get caught up in the constant day-to-day when you're looking over the horizon, both in terms of the big challenges we face, like becoming more energy-independent, and dealing with the day-to-day crises that are unavoidable.
Typical pattern of artificial lighting in a windowless side-room; a constant day-time light intensity of 180 lux, which abruptly reduces at night-time (e).
