It’s today.
I love this picture so much.

I’ve learned that the iconography of the disappearing feet is a pretty late medieval development – more on that at Ad Imaginem Dei – and that there is lots more of it. The earlier iconography of the ascension is equally awesome, though.
Much more recently, Salvador Dali’s vision of the event is also fabulous.
A handful of resources:
- Stephen T. Davis, “The Meaning of the Ascension for Christian Scholars,” Reformed Journal (2007)
- Gerritt Scott Dawson, “Seven Things to Like About the Ascension” at Union Resources
- Greg Moore & Cameron Merrill, “Claiming Holy Ground,” in Ministry Matters (2016)
- Peter Mulholland, The theology of the ascension, Durham e-theses (1998) – particularly wonderful
- Fr Stephen Wang, “The Ascension of Jesus into Heaven” – YouTube, about 26 minutes
To say nothing of Douglas B. Farrow’s Ascension Theology and its various commentators (like here and here and here).
He ascended to heaven …
the Apostles’ Creed
One more thing: here’s the beautiful interior of Ascension Catholic Church, Oak Park, Illinois, a place and a congregation that has my undying gratitude and affection for being open to an anonymous wanderer on her way back to church.