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Ok, to add a little more detail to my explanation that might help you.
Get a bit of paper and draw a small circle on it, call that the sun.
Out on the edges write "orion" on one side and "scorpius" on the other.
Half way between the sun and your "constellations" draw a circle around the sun to represent the earths orbit (obviously this is immensely out of scale)
Now, draw a circle on this "orbit" to represent the earth, make it directly between your sun and your orion, shade in the half that is facing away from the sun to show that that side of your earth is in darkness. The night (dark) side of your earth is facing orion, so orion is high in the sky at night and visible. The side facing scorpius is also facing the sun, so scorpius is in the sky during daylight and not visible.
Now, roll forward six months, the earth will be on the other side of the sun, now the side away from the sun (night time) can see scorpius and the side that would see orion is in sunlight.
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