The interesting thing about the star system Gliese 777 is that it's maximum altitude at Giza is close to 90 degrees(zenith). Actually it's declination in 17 years (2027 AD) will be exactly equal to it's latitude as it is mapped at Giza. Here is a Starry Night pic of the sky:



This along with other confirming info answers three of our questions:

1) Where did they come from?
2) Where is the Hall of records?
3) When will they return?