Thrisanku Swargam

I once heard my grandmother, who was in a dilemma, complaining about being in a "Thrisanku Swargam". On analysing this, I found a very interesting piece of information related to our
Itihasas and astronomy.
This is from the Valmiki Ramayana:
Once, there was a king called Thrisanku who wanted to go to Swargam (Indra's abode) in his bodily form itself, without dying. He approached Sage Vasishta who promptly refused to help him. Now, Sage Vishwamitra tested his powers by sending Thrisanku to heaven (Swargam). As Thrisanku was ascending, the Devas kept pushing him below, as a mere mortal was forbidden to enter Swarga.Enraged, Vishwamitra used his powers to create a parallel heaven, called Thrisanku Swarga where Thrisanku could live. Since this is neither here (on earth) nor there (heaven), "Thrisanku Swarga" is used as a metaphor to describe a situation where a person is finding it difficult to choose some alternative and is stuck in between.
What's amazing is that this Thrisanku Swargam refers to a constellation in the sky, commonly
known as the Crux/Southern Cross, seen from the southern hemisphere. Shaped like a cross, it
is the smallest of the 88 constellations we can see from here. What's more, "sanku" is also
an astronomical unit used by our ancestors, and thrisanku means thrice that amount-
Thrisankhu MahaYojanas is equal to 205 light years, which is the distance of this
constellation from the earth, as found out by modern astronomers!
Our forefathers were truly very intelligent!