Four short lines, and they carry a feeling of being lost in time. The speaker begins by admitting that "infinity failed me." Something they trusted to be endless, or to give life meaning, has let them down. Then evening arrives at "gray noon," so the day seems to collapse before it ever properly begins. Light and darkness blur together, and the usual markers of time stop working.
The third line, "No anchor brought order," suggests nothing is holding the speaker steady. The word "knot" in the last line could point to a rope, a ship's speed, or a measure of distance, though the poem never says which, so the sea is only a possible setting. Either way, the speaker has shrunk time down to one small unit per night. The mood is bleak and quiet. There is no panic, just a plain, tired habit of counting to stay oriented when bigger ideas have stopped helping.