How does siriosous starts?

"SiriOSous" appears to be a misspelling or a less widely recognized term. If you meant "Sirius," the bright star in the night sky, it is often referred to as the "Dog Star" and is part of the constellation Canis Major. It rises in the east before dawn during late summer, marking the onset of the "Dog Days" of summer in ancient cultures. If you meant something else, please clarify for a more accurate response.