On any interstellar journey going outward from our solar system, one eventually reaches a point where the total amount of light received from our Sun is exactly matched by the total amount of flux coming from all cosmic sources external to our solar system. The heliocentric distance of that boundary is dubbed the "Ahad radius", and exists at the edge of the "Ahad sphere of solar illuminance", some 11,500 astronomical units (roughly a trillion [10^12] miles) from Earth.

On first definition of this heliocentric boundary, Abdul Ahad wrote:-

"Beyond the outer edges of this theoretical sphere, the feeble currents of light coming from its core (i.e. our own distant Sun) will cease to make any noticeable ripples in the calm waters of the surrounding cosmic ocean..." - July, 2004

My guess is that Sol can be seen from an object orbiting stars much further away than Sirius assuming there is someone or some thing looking. If so, I would consider the light coming from the sun to be making "a noticeable riple". I'm not sure whether such a definition is either accurate or useful. The poetry seems obtuse.

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For those inclined to oppose human meddling with the structure of the universe or the composition and configuration of objects and groups of objects within the universe, consider:
Whether there is a limit to the magnitude of a modulation of chaos below which order remains invariant? Or, is order but a fiction invented by perspectives applied over finite, however large, time intervals?

Poetry is poetry and always meant lightly...

The total light of the night sky will drown out the sun. The "Ahad radius" marks a psychological boundary for a traveller leaving his home solar system going out into the night of 45,000 years... when he is no longer experiencing the solar light dominance that he is used to. He might even suffer 'withdrawal symptoms' with a sense of loss... and experience nightmares as in Ahad's "First ark to alpha centauri" film here:

http://uk.geocities.com/aa_spaceagent/firs...hacentauri.html

:unsure: