#if !defined(SPACE_AGE_H)
#define SPACE_AGE_H

namespace space_age {
class space_age {
public:
  space_age(unsigned long secs);

  unsigned long seconds() const;
  float on_earth() const;
  float on_mercury() const;
  float on_venus() const;
  float on_mars() const;
  float on_jupiter() const;
  float on_saturn() const;
  float on_uranus() const;
  float on_neptune() const;

private:
  unsigned long seconds_;
};
} // namespace space_age

#endif // SPACE_AGE_H