The Republic is overthrown. Emperor Palpatine rules
the galaxy with an iron fist.
Second only to the Emperor is Palpatine's apprentice —
the fearsome Darth Vader. Vader's fall to the dark side
of the Force and defeat at the hands of Obi-Wan
Kenobi leaves him confined to a suit of cybernetic
armor to preserve his life. Now, he lives only to serve
his master's Empire.
To ensure the survival of this New Order, Vader leads a
squad of dark side adepts — the Inquisitorius — in
rooting out and destroying the greatest threat to
Palpatine's rule — the remaining Jedi Knights....
↑The events of Tarkin take place five years after the rise of the Galactic Empire, which Star Wars: Galactic Atlas dates to 19 BBY. Therefore, Tarkin must be set in 14 BBY. As Darth Vader knows about Wilhuff Tarkin's past on Eriadu in Darth Vader: Dark Lord of the Sith 18, which he only learned about in Tarkin, issue 18 must take place after the novel. The later issue Darth Vader: Dark Lord of the Sith 19 featured the Second Sister, who was killed in Star Wars Jedi: Fallen Order. Fallen Order takes place five years after the Great Jedi Purge, which is dated to 19 BBY by Star Wars: Galactic Atlas. Therefore, Star Wars Jedi: Fallen Order is also set in 14 BBY. As Darth Vader: Dark Lord of the Sith 18 is between both Tarkin and Darth Vader: Dark Lord of the Sith 19, the events of the issue must take place in 14 BBY. Therefore, the events of issue 19 must also occur in that year, as the issue is after issue 18 and before the Second Sister's death.
Darth Vader (2017) #19 on Marvel Comics' official website (backup link)
