Once upon a time, when God created the Universe, Galaxies, planets, stars, also in a small Galaxy that people called the Milky Way, in an even smaller Solar System, he arranged everything to obey a certain order: the planets revolved around the Sun, the satellites of the planets revolved around their planets, and so on down to the smallest particles – atoms, where electrons revolve around their nucleus. When He created the Earth, He decreed that there would be a day when the Sun illuminated the corresponding side of the planet and there would be a night when this side was unlit. At the same time, He decided that the day, the son of the Sun, would necessarily give way to his companion, the night, the daughter of the Moon, and she would give way to the day.

Time passed. And then one day the day was outraged: Why should I give way to the night, because it only causes problems, at night all living things fall asleep, life stops, it blows cold, and during the day everything boils, everyone rejoices, the sun – my father - warms everyone with warmth. To which the night – daughter of the moon reasonably replied: And why should I give way to the day: After all, look, the Sun is not eternal, someday it will go out and what? Where then your day will be, it will not be at all! And I will live forever." God listened, listened to their argument and said: "Day, what would you do if there was no night? All living things would just get tired of eternal joy, eternal dancing and round dances. When would you take a vacation and where? Under the scorching rays of the sun? Or is it still better to go to visit at night, she has a break from worries for your whole day. Do you, day, want all living things to grow always, without stopping, without rest, without accumulating strength for new growth?". Thought day. After all, how well they spent time with the night, when everything around them became dark, when it was possible not to hide behind the trees, but just to lie down under it and whisper about something with the night away from prying eyes. Yes, I thought a day, I seem to have everything, but something is missing. And just what I have enough, rest, and relaxation, no one can give me more, except my beloved friend - night. I travel a lot, I know a lot, but I have no one to share it with. After all, everyone knows about it during the day, and when night comes, everyone is asleep.

"And you, night," the God continued, addressing the night, "doesn't the Sun warm the Earth and all living things on it so that all this grows and develops? If all this does not happen, then why will I need you, one such, a symbol of darkness, evil and vice. Who will highlight and disarm you if there is no day?" Yes, the night thought, remembering how good it was for her when they spent time together with the day. He warmed her, he amused her, danced with her. And she wasn't bored either. He knew how to melt her eternal cold, he knew how to give her what she had never had and would never have – the all-consuming light of kindness and love. And somehow she felt even colder at that moment, tears welled up in her eyes. She thought: I seem to have everything, eternal life is in store for me, but something is missing. And then, stealing a glance at her friend of the day (if only he didn't notice that I was thinking about him and secretly looking at him), all the exciting moments when they were alone with him flashed before her eyes again, when he told her where he had traveled, how much he had seen, what I've heard it from others. After all, everyone loved him, everyone shared their secrets with him, because he gave everyone his warmth.  And at night everyone slept, life stopped, and there was no one to talk to at night. He gave her life, he showed her the way, he filled her, in the end, with wisdom.

And then they decided to make peace and never argue about who is more important and who is more necessary. If there is no one, there will be no other. Either together or in no way. And God said to them: "So that there would be no more disagreements between you, you will have a son and a daughter – morning and evening. They will be like you, each of them will have a little bit of each of you, and you will love them as yourself. And through loving them, you will love each other even more. Together you will be one family and I will give your family a name – a day.

And so it was decided. And nothing has changed since then. And everyone is happy about this state of affairs.