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Day and night. The rising sun and night starry sky over the foggy mountain valley. Fairytale conceptual landscape.
Green field in day and night.
 Green field in day and night. Elements of this image furnished by NASA
Beautiful view of sky through windows in day and night, collage
The circadian rhythms are controlled by circadian clocks or biological clock

Free stock photosday-and-night (174)

Fireworks with little reddish puffs of smokeImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/fireworks-reddish-puffs-smoke-35935237">Image used under license from Freestock.com</a>
Fireworks streamers -- mostly white, some red and a few blueImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/fireworks-streamers-mostly-white-red-blue-33678541">Image used under license from Freestock.com</a>
Big-bang fireworksImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/bigbang-fireworks-33350320">Image used under license from Freestock.com</a>
Two identical bursts of fireworks facing each otherImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/two-identical-bursts-fireworks-facing-37579816">Image used under license from Freestock.com</a>
Two large multicolored bursts of fireworksImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/two-large-multicolored-bursts-fireworks-36672973">Image used under license from Freestock.com</a>
Fancy fireworksImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/fancy-fireworks-59459518">Image used under license from Freestock.com</a>
Two bursts of multicolored fireworksImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/two-bursts-multicolored-fireworks-57323029">Image used under license from Freestock.com</a>
Various fireworks effectsImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/various-fireworks-effects-55287592">Image used under license from Freestock.com</a>
Bursts of fireworks with white-hot cores and reddish-orange, greenish, and white streaks with feathery motion blurImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/bursts-fireworks-whitehot-cores-reddishorange-greenish-57732211">Image used under license from Freestock.com</a>
White-hot burst at core of reddish-orange fireworks ball (more in my gallery)Image used under license from Freestock.com<a href="https://www.freestock.com/free-photos/whitehot-burst-core-reddishorange-fireworks-ball-54958261">Image used under license from Freestock.com</a>
Big dandelion burst above small bursts of fireworks with various effectsImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/big-dandelion-burst-small-bursts-fireworks-54267352">Image used under license from Freestock.com</a>
Small white burst of fireworks "inside" much larger reddish-orange burstImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/small-white-burst-fireworks-larger-reddishorange-54200503">Image used under license from Freestock.com</a>
Variety of low-altitude fireworks effectsImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/variety-lowaltitude-fireworks-effects-59098393">Image used under license from Freestock.com</a>
Simultaneous bursts of two kinds of fireworks near one anotherImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/simultaneous-bursts-two-kinds-fireworks-48028903">Image used under license from Freestock.com</a>
Two small bursts of fireworks, one with rocket trailImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/two-small-bursts-fireworks-rocket-trail-39419038">Image used under license from Freestock.com</a>
Fireworks bursting near one another with reddish smokeImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/fireworks-bursting-reddish-smoke-37695322">Image used under license from Freestock.com</a>
Vivid reddish orange burst of fireworksImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/vivid-reddish-orange-burst-fireworks-37477480">Image used under license from Freestock.com</a>
Burst of fireworks with feathery rocket trailImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/burst-fireworks-feathery-rocket-trail-36129217">Image used under license from Freestock.com</a>
Two bursts of fireworks, one above the otherImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/two-bursts-fireworks-36947608">Image used under license from Freestock.com</a>
Burst of fireworks off centerImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/burst-fireworks-center-33236101">Image used under license from Freestock.com</a>
Yellowish burst of fireworksImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/yellowish-burst-fireworks-37695148">Image used under license from Freestock.com</a>
Low-altitude starburst fireworks with copy spaceImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/lowaltitude-starburst-fireworks-copy-space-36672562">Image used under license from Freestock.com</a>
Burst of fireworks with blue and orange streaks near top of frameImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/burst-fireworks-blue-orange-streaks-top-36670576">Image used under license from Freestock.com</a>
Modern clock showing precise time, hours and minutesImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/modern-clock-showing-precise-time-hours-166272320">Image used under license from Freestock.com</a>
Bright burst of fireworks with glittery streaksImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/bright-burst-fireworks-glittery-streaks-58599220">Image used under license from Freestock.com</a>
Burst of fireworks with rocket trail, white-hot core, and feathery motion blurImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/burst-fireworks-rocket-trail-whitehot-core-58327288">Image used under license from Freestock.com</a>
Yellowish burst of fireworks with red-orange smoke near its centerImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/yellowish-burst-fireworks-redorange-smoke-center-56856694">Image used under license from Freestock.com</a>
Yellow and orange burst of fireworks with feathery motion blurImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/yellow-orange-burst-fireworks-feathery-motion-56620156">Image used under license from Freestock.com</a>
Bursts of fireworks one above anotherImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/bursts-fireworks-57172687">Image used under license from Freestock.com</a>
Yellow-orange burst of fireworks with some blue tips, in square formatImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/yelloworange-burst-fireworks-blue-tips-square-55291441">Image used under license from Freestock.com</a>
Three bursts of fireworks in a group, with two rocket trailsImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/three-bursts-fireworks-group-two-rocket-54115312">Image used under license from Freestock.com</a>