of course night is a scientifically defined concept (which also takes human subjectivity into account). The term in science is "Astronomical night" and it has a

of course night is a scientifically defined concept (which also takes human subjectivity into account). The term in science is "Astronomical night" and it has an exact physical description which can be unambiguously determined through scientific measurement. comments like yours don't add much value to discussions about race.