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The Time Told by the Shadow’s Direction (illustration)
FILE No.47Unsolved

The Time Told by the Shadow’s Direction

Difficulty ★☆☆about 3 minEveryday MysteryDirection of shadowsPosition of the sun
A man claims "a photo taken at 9 a.m.," but the shadow in the photo does not match the morning sun.

Case Record

A statue in a park was smashed. One of the suspects, Toriyama, showed a photo as his alibi.

"I took this photo around 9 a.m. in front of City Hall, to the south. That is about when the statue was smashed. I was at City Hall then."

The photo shows Toriyama standing in front of City Hall, with a clear shadow stretching along the ground. The shadow stretches long toward the east. The photo was taken on a clear autumn day.

The sun rises in the east, passes through the southern sky and sets in the west.

Your question

Was this photo really taken around 9 a.m.?

Case Files

Evidence

Diagram

Shadow and direction in the photoItemDetailToriyamaIn front of City Hall (to the south)ShadowStretches eastClaimed timeAround 9 a.m.Sun: rises in the east, south at midday, sets in the west.
Diagram

Timeline

  1. The statue is thought to have been smashed.
  2. Toriyama shows the photo and claims an alibi.

Hints

If you get stuck, open the hints one at a time, in order.

Open hint 1

In which direction is the sun in the morning?

Open hint 2

On which side of the object does the shadow stretch, compared with the sun?

Open hint 3

Which direction did the shadow in the photo stretch?

Solve It

Your question

Was this photo really taken around 9 a.m.?

Choose the answer closest to the truth.

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The Truth

It was most likely taken in the afternoon, so the 9 a.m. claim is doubtful

The answer is: it was most likely taken in the afternoon, so the 9 a.m. claim is doubtful.

The sun rises in the east. In the morning the sun is in the east, so shadows stretch the opposite way, to the west. In the afternoon the sun leans to the west, so shadows stretch to the east.

The shadow in the photo stretches east. That means the sun was on the west side, and the photo was probably taken in the afternoon. The claim of 9 a.m. is quite likely a lie.

Shadow to the east means afternoonMorning: the sun is in the east; shadows stretch westAfternoon: the sun is in the west; shadows stretch eastThe photo’s shadow stretches east, so it is likely an afternoon photo
Diagram of the solution

Key Points

  • A shadow stretches on the side opposite the sun
  • The sun is in the east in the morning and in the west in the afternoon
  • The direction of the shadow in a photo shows morning or afternoon

Why people get fooled

Looking at a photo, your eyes go to the person and the background, and you miss the small clue of the shadow’s direction.

Similar tricks

  • The type that judges the time of day from shadow direction
  • The type that checks details of a photo

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