We're using a grid-based combat system for combat. The party cleric is learning the joys of Spirit Guardians, which has a range of Self (15-foot radius):
You call forth spirits to protect you. They flit around you to a distance of 15 feet for the duration.
Again, as we're using a grid, the cleric picks one of the four intersections around her to center the spell effect off of, per the guidance on adjudicating areas of effect on a grid on DMG p. 251:
The area of effect of a spell, monster ability, or other feature must be translated onto squares or hexes to determine which potential targets are in the area and which aren't. Choose an intersection of squares or hexes as the point of origin of an area of effect, then follow its rules as normal.
Which intersection she chooses has an effect on the enemies who might be caught within the spell.
The spell moves with the caster's "self" during the duration/concentration. Two questions:
As the caster moves, can the relative intersection they chose be changed? For instance, if the cleric chose the lower right intersection to their square to be the center of the radius when cast (as in the image), and then moves three squares to the left, does the Spirit Guardians "circle" remain centered on that lower right intersection? Or can they change that to be (e.g.) the upper left intersection?
If the answer to #1 is "Yes":
Can the cleric change the placement of the spell's area without moving (thought of, perhaps, as leaning to one corner of their 5-foot square vs. another corner)?
Note: There are aspects of this question that may be already partially answered, depending on which of the answers one selects here: Does the radius of the Spirit Guardians spell depend on the size of the caster? (and in connected questions)