The trilogy is set over the Easter period. In Canto XXI of the Inferno, Dante is told that "yesterday, five hours by the clock from now, 'twas just twelve hundred, sixty and six years since the road was rent by earthquake shock". This refers to the earthquake that occurred when Jesus was crucified.
I am reading the Comedy in Dorothy L. Sayers' translation, which helpfully includes the time at which each canto is set. Occasionally Dante includes a reference to the time at which something occurs, and so Sayers' scheme is as follows:
Canto I
|
Good Friday – morning
|
“Then I
looked up and saw the morning rays” (I.16)
|
|
Cant. I –
VII
|
Good
Friday – evening
|
“To that
place wherein the sun is mute” (I.60)
|
|
Canto VII
|
Good
Friday – midnight
|
“All
stars that rose when I set out now sink” (VII.98)
|
|
Cant. VII
– XXVIII
|
Holy Saturday – morning
|
“Horizon-high
the twinkling Fishes swim” (XI.113) = 4am
|
|
Cant.
XXVIII – XXXIV
|
Holy
Saturday – afternoon
|
“Night
is rising on the world once more” (XXXIV.68)
|
|
Cant.
XXXIV
|
Easter Sunday – morning
|
“By this
we climbed, and thence came forth, to look once more upon the
stars” (XXXIV.138-139)
|
|
Cant. I –
IV
|
Easter
Sunday – morning
|
“And the
dawn rose triumphant, making flee the morning breeze before her”
(I. 115-116)
|
|
Canto IV
|
Easter
Sunday – noon
|
“Look
how the sun doth stand Meridian-high” (IV.137)
|
|
Cant. IV –
VIII
|
Easter
Sunday – afternoon
|
“Te lucis ante, so devoutly he breathed forth” (VIII.13) –
this is Ambrose's evening hymn
|
|
Cant. IX –
XI
|
Easter Monday – morning
|
“About
the hour when the sad swallow... pipes out her mournful way to
greet the dawn” (IX.13-15)
|
|
Canto XII
|
Easter
Monday – noon
|
“Look how the day's sixth handmaiden resigns her office now” (XII.80-81)
|
|
Cant. XIII
– XVII
|
Easter
Monday – afternoon
|
“When I
first spied the sun again, which now was near to sinking”
(XVII.9)
|
|
Cant. XVII
– XVIII
|
Easter
Monday – evening
|
“Retarded
near to midnight now, the moon... was making the stars appear but
dimly strewn” (XVIII.76-78)
|
|
Cant. XIX
– XXIV
|
Easter Tuesday – morning
|
“Broad
day had masterdom now of the holy mountain's every ledge”
(XIX.37-38)
|
|
Cant. XXV
– XXVI
|
Easter
Tuesday – afternoon
|
“The Sun
had to the Bull transferred” (XXV.2) = 2pm
|
|
Canto
XXVII
|
Easter
Tuesday – evening
|
“As when
his earliest shaft of light assails the city where his Maker shed
His blood... so rode the sun; thus day was nightward winging”
(XXVII.1-5). Dante places Purgatory in the southern hemisphere.
When it is dawn in Jerusalem, it is sunset on Mount Purgatory
|
|
Cant.
XXVII – XXXIII
|
Easter
Wednesday – morning
|
“The
shades of darkness fled away all round” (XXVII.112)
|
Paradiso doesn't follow a particular time scheme. But you can see from this table that most of the reading is to be done on the Saturday. It's quite a challenging reading schedule.