The clock track
(the right and upper borders of Figure 2) designate the row/column count to the reader.
On the other hand, the real-time digital clock recovery performed in the ASIC uses the digitized waveform in the same way as the batch mode but, unlike the batch mode, the recovered clock tracks
the signal phase continuously.
The i.LON's built-in astronomical clock tracks
the changes in sun light levels, enabling dimming of the lamps from midnight until dawn, which increases equipment longevity while reducing energy costs.
Long clock tracks
are unwise, too, as they can introduce sampling jitter, so it is best if the system ASIC is placed next to the AFE IC.
Almanacs forecast phases of the moon, as did mechanized indicators on clock dials (the dial of a tall case clock tracked
the moon's waxing and waning).