Conversation so far:
When was Clannad's album Sirius released?
Sirius was released by RCA in 1988
What singles were from the Atlantic Realm album by Clannad?
Did Clannad's Atlantic Realm album receive any awards?
Why was Clannad's Atlantic Realm album received with critical apprehension?
What singles were from The Angel and the Soldier Boy album by Clannad?
The single A Dream in the Night“
How did Clannad's album The Angel and the Soldier Boy do on music charts?
Did Clannad go on tour during the time of the Sirius, Atlantic Realm, and The Angel and the Soldier Boy albums?
In 1989, Clannad embarked on their first worldwide tour.
Where did Clannad go while on tour in 1989?
What was a career highlight for Clannad during the time of Sirius, Atlantic Realm, and The Angel and the Soldier Boy?
Two greatest hits albums were released at around this time.

Question: What were the names of the greatest hits albums?
Self-contained rewrite: What were the names of Clannad's greatest hits albums released during the Sirius, Atlantic Realm, and The Angel and the Soldier Boy period?