Sagittarius

"Theoretically, one man can run a spaceship..."
-Poul Anderson, "Holmgang" IN Anderson, Cold Victory (New York, 1982), pp. 112-163 AT p. 123.

As in his Technic History, Anderson writes as if he is familiar with future spacecraft.

"...unemployed spacemen available for immediate hiring are found once in a Venusian snowfall." (ibid.)

A good future simile, although it should be "...a Venerian snowfall."

"...there was the hill he had left, stark against Sagittarius." (p. 162)

This is Sagittarius as seen not from Earth but from an asteroid during the Solar Union period of the Psychotechnic History.

"'The Union, both as a cultural and a semipolitical unit, is expanding inward toward Galactic center, Sagitarri...
"And where are we? On the Sagittari-ward frontier of the Union...'"
-Poul Anderson, The Peregrine (New York, 1978), Chapter II, p. 15.

"'You will go the Sagittarian frontier of the Stellar Union...'" (Chapter IV, p. 23)

This is Sagittarius as perceived by interstellar travelers during the Stellar Union period of the History.

"'You haven't seen starlight till you've been by Sagittarius.'"
-Poul Anderson, "The Chapter Ends" IN Anderson, Starship (New York, 1982), pp. 253-281 AT p. 262.

"'...there'll be Hulduvian colonies between Sol and Sagittarius...'" (p. 268)

This is Sagittarius as perceived by interstellar travelers in a much later period of the History when human civilization has moved from the Solar System to the Galactic center. Thus, successive references to Sagittarius show us how far humanity travels in this future history.