On its own, Kijun-sen shows the midpoint price for the last 26 periods. Similar to a moving average, when the price is above the base line it indicates the price is above the midpoint and therefore short-term price momentum is up. This is further confirmed if the Kijun-sen line is angled upwards.
When the price is below the base line, and especially if Kijun-sen is angled downwards, that indicates price momentum is to the downside as the price is below the 26-period midpoint. While 26-periods is typically used for this calculation, this can be altered to suit individual preference. A smaller number of periods, such as 15, will track the price more closely. A larger number of periods, such as 45, will not track the price as closely.