Printable case study kit
The Missed Birthday
Six months on Mercury can mean a different birthday count when you return to Earth.
Mercury vs Earth · Medium · 6 min read
Read the story: /vignettes/missed-birthday
📄 Student worksheet
After reading “The Missed Birthday,” complete the tasks below. Use the story, sidebar metrics, and Mercury vs Earth time facts.
- Summarize the main conflict in “The Missed Birthday” in 2–3 sentences.
- Pick one metric from the case study sidebar and explain why it matters to the characters.
- Name one habit from Earth that would NOT work on Mercury vs Earth without change.
- Propose one new rule, ritual, or invention colonists might adopt.
| Concept from story | Earth habit | On-world change | Your solution |
|---|---|---|---|
Try the planetary age calculator with your birthdate. Open calculator →
🎤 5-minute read-aloud script
Read aloud in class or at home (~5 minutes).
Today we are exploring The Missed Birthday from Time Across the Solar System.
Remember: a year is one trip around the Sun, and a day is how long a world spins—or how long the Sun takes to cross the sky.
Six Mercury months can skip Earth birthday rituals you expected to keep.
As you listen, picture how characters must plan ahead because clocks and seasons do not match Earth.
Travelers need two calendars—or new shared rituals.
Discuss with someone nearby: what surprised you most, and what would be hardest for you?
Visit tatssp.com/calculator to see your own age on different worlds.
📊 Timeline & metrics (printable)
- 🎂 Before trip — Earth party planned: Family marks date on Earth calendar
- 🔬 Month 4 — Mercury work intense: Sunrise still weeks away
- 😮 Return — Surprise greeting: “You missed it” — different year count
- 📅 Resolution — Dual calendar: Celebrates both Mercury and Earth dates
🗣️ Discussion guide
Travelers need two calendars—or new shared rituals.
For Parents
- What would surprise you most about life in this story?
- How would you explain local time to a child?
For Educators
- What science topics does this story illustrate?
- How could students model this planet’s day/year?
For Students
- Would you want to live where this story is set? Why?
- What habit would be hardest to change?