Why Do Competent People Consult the "Twenty-Four Solar Terms"? A Planner Method for Adults to Maintain Mental and Physical Condition

🌿 24 Solar Terms・Planner Tips

Why do successful people look at the "24 Solar Terms"?
A planner method for adults to maintain physical and mental condition

A rational self-care approach that leverages the rhythm of nature.

📅 2026 ⏱ Approx. 4 min read ✍ Forte Diary
24 Solar Terms Forte Diary

"Why do I feel out of sorts?" "I can't concentrate."
Perhaps it's the season.

If you look at your digital calendar, you can immediately see your next appointments and deadlines. Yet, are there days when you feel "out of sorts" or "can't quite concentrate on work"?

We live our daily lives within the uniformly divided "clock time," but human bodies and minds are not machines. We are directly affected by the ever-changing natural environment: atmospheric pressure changes, daylight hours, temperature, and so on.

Currently, self-care methods incorporating the "24 Solar Terms" are gaining attention, particularly among business professionals in their 30s to 50s. This is not merely "elegance" but a highly rational life hack for skillfully integrating the rhythm of nature to optimize one's physical and mental condition.

A month is too long. Create a rhythm with a "15-day cycle."

Have you ever set a vague goal like "do it this month" only to lose momentum halfway through? The 24 Solar Terms divide a year into 24 equal parts, giving seasonal names to approximately 15-day periods. This "two-week (approx. 15-day)" cycle is highly effective for managing the condition of modern people.

  • First half (Setsuiri): Perceive environmental changes (signs) and fine-tune plans.
  • Second half (Chuki): Execute (Do) with a stable rhythm.

The monthly schedule of Forte Diary includes these 24 Solar Terms. By using the "solar terms" as divisions, you can reset prolonged tension and maintain a consistent, "good rhythm" in your daily life.

Practice! Utilizing the 24 Solar Terms for "Strategic Conditioning."

How exactly should you incorporate this into your planner? Here are three ways to use the seasonal words noted in Forte Diary as "signs to manage your condition."

24 Solar Terms Planner Utilization
CASE 01

"Strategic Rest" by deliberately slowing down

❄️ Winter Solstice (Tōji): Around December 22

The period with the longest night and shortest day of the year. This timing, when "yin" peaks, is suitable for accumulating energy internally rather than expending it externally.

✦ Conditioning Tip

When you see "Winter Solstice," decide for that week to "not overload with new projects" or "get 30 minutes more sleep." Instead of pushing yourself, treating it as a "maintenance period" for the next busy season helps prevent burnout.

CASE 02

Catching signs of change to avoid "poor condition"

🌧️ Rain Water (Usui): Mid-February

The period when snow turns to rain and ice begins to melt. This is also a time when temperature differences become extreme, making it easy for the autonomic nervous system to become unbalanced.

✦ Conditioning Tip

Write "Beware of temperature changes" or "Headache potential" in the memo section of your Weekly Planner. If you feel your performance drop, you can objectively view it as "it's the changing of the season (Usui), so now is a time for defense." This is a mental management technique to perform tasks calmly without falling into unnecessary self-reproach.

CASE 03

Resetting your senses to enhance "concentration"

🌸 Pure Brightness (Seimei): Early April

A time when all things are pure and vibrant.

✦ Conditioning Tip

If you're stuck with desk work, add a task to "get some fresh air during lunch break." Just jotting down a word about the smell of the wind or the blueness of the sky during your commute in the Forte Diary's Note section can switch your brain and boost your concentration in the afternoon.

Forte Diary supports you as an "external brain"

Forte Diary, while providing the functionality of a business planner, subtly yet reliably conveys the "changing of the seasons."

In the midst of a busy daily life, the seasonal words that jump out at you when you open your planner act like a small coach, managing you by suggesting, "Perhaps it's time to adjust your pace," or "Now is not the time to push yourself."

In 2026, why not start managing your schedule with the "adult composure" that comes from aligning with the seasons, rather than just being driven by numbers and deadlines?

Forte Diary 2026

A single volume to support your performance in 2026

Forte Diary is committed to a simple design that can be used by both men and women, and a paper quality that is easy to write on without interrupting your thoughts.

If you are in your 30s to 50s and wish to "stabilize work performance," "maintain health for the long run," or "improve your quality of life (QOL)," we hope you will choose Forte Diary as your "partner."

✦ Forte Diary

Create your best condition with the rhythm of the seasons.

A planner for adults, with a focus on simple design and writing comfort.
See all color lineups here.

See all Forte Diary lineups →

We hope you find the perfect one for you 📖

Back to blog