Earth Timeline vs. Teenager.docx.docx



A visual representation of the History of EarthToday is: ________________________________, it is the _________________day of the year.This is the Julian Date.How old am I now in – (use the applet below):(or)My birthday is: __________________19____.Use the Chart 1 to find out what day of the year that date was._______ Subtract 1. Subtract that answer from 365. __________ Your current age_________________ times 365.25 ________________Add the number from Step 1. ______________Add the today’s Julian date minus 1. ______________This is your age in days; this is the value for the end of your timeline. Enter it on the right side of the timeline. Fill in the remaining hash marks with the appropriate numbers. Divide the step 4 value by 2, this is your halfway point, divide by 2 again, this is your first quarter. Add the first quarter value to the half; this is your three-quarter value. Divide the first quarter value by 20. Note that number and add that to the three quarter value. Continue to add until you have a value for each hash mark on the bottom line. This is the value between each of the small hash marks at the end of your line. For most of you, each of these will represent about two months of time, which is 1.25% of the entire line. The bottom line is an enlargement of the last 1/8 of the top line. Label the bottom of both lines in percentages in the same manner as above.Pick 10 events in your life that are memorable. Try to start as far back as you can. For example, when you first walked, talked, learned to ride a bike, etc. Assign a date to each event, if you don’t know the exact date, estimate. Use a similar conversion from above to convert the date into days. (See Table 2) Subtract each number of days from the total number of days of your life and divide that number again by the total and multiply by 100. This is the percentage of time that has passed since you were born. Log each event on your timeline. EventDateDays Percentage__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Table 2Event12345678910Find the Julian date and subtract 1.Subtract your birth year from the year of the event. Subtract 1. Multiply by 365.Find today’s Julian date.Add all three numbers and divide by your total age in days. Multiply by100. This is the percentage that you will plot on the timelines.Now we will compare the geologic time scale of Earth to that of yours. Calculate the percentage of time that has passed for each of the following events. (Ex. Age of the Dinosaurs begins, 5 billion minus 245 million divided by 5 billion = 0.951 x 100 = 95.1%. You would plot this at the 95% mark on the bottom timeline.) Plot them on the bottom of the time. Remember that a billion is 109 and a million is 106.Geologic Events Event _____Days Percentage5 billion years ago: earth is formed, along with the other planets3.5 billion years ago: first life appears in oceans 0.65 billion years ago: first multicellular organisms appear0.5 billion years ago: first land plants with inner vessels250 million years ago: mass extinction of 99% of all life245 million years ago: Age of Dinosaurs begins65 million years ago: Age of Dinosaurs ends, with mass extinction of 70% of all living things (K-T Event)100,000 years ago: First Humans appear10,000 years ago: Recorded human history beginsYear 0. Chart 1: Julian Date: Day of Year ChartFirst column within each month is for regular years. The second is for leap years: 1972, 1976, 1980, 1984, 1988, 1992, 1996, 2000, 2004, 2008, 2012, 2016, 2020.day ofmonthJanFebMarAprMayJunJulAugSepOctNovDec1001032 032060 061091 092121 122152 153182 183213 214244 245274 275305 306335 3362002033 033061 062092 093122 123153 154183 184214 215245 246275 276306 307336 3373003034 034062 063093 094123 124154 155184 185215 216246 247276 277307 308337 3384004035 035063 064094 095124 125155 156185 186216 217247 248277 278308 309338 3395005036 036064 065095 096125 126156 157186 187217 218248 249278 279309 310339 3406006037 037065 066096 097126 127157 158187 188218 219249 250279 280310 311340 3417007038 038066 067097 098127 128158 159188 189219 220250 251280 281311 312341 3428008039 039067 068098 099128 129159 160189 190220 221251 252281 282312 313342 3439009040 040068 069099 100129 130160 161190 191221 222252 253282 283313 314343 34410010041 041069 070100 101130 131161 162191 192222 223253 254283 284314 315344 34511011042 042070 071101 102131 132162 163192 193223 224254 255284 285315 316345 34612012043 043071 072102 103132 133163 164193 194224 225255 256285 286316 317346 34713013044 044072 073103 104133 134164 165194 195225 226256 257286 287317 318347 34814014045 045073 074104 105134 135165 166195 196226 227257 258287 288318 319348 34915015046 046074 075105 106135 136166 167196 197227 228258 259288 289319 320349 35016016047 047075 076106 107136 137167 168197 198228 229259 260289 290320 321350 35117017048 048076 077107 108137 138168 169198 199229 230260 261290 291321 322351 35218018049 049077 078108 109138 139169 170199 200230 231261 262291 292322 323352 35319019050 050078 079109 110139 140170 171200 201231 232262 263292 293323 324353 35420020051 051079 080110 111140 141171 172201 202232 233263 264293 294324 325354 35521021052 052080 081111 112141 142172 173202 203233 234264 265294 295325 326355 35622022053 053081 082112 113142 143173 174203 204234 235265 266295 296326 327356 35723023054 054082 083113 114143 144174 175204 205235 236266 267296 297327 328357 35824024055 055083 084114 115144 145175 176205 206236 237267 268297 298328 329358 35925025056 056084 085115 116145 146176 177206 207237 238268 269298 299329 330359 36026026057 057085 086116 117146 147177 178207 208238 239269 270299 300330 331360 36127027058 058086 087117 118147 148178 179208 209239 240270 271300 301331 332361 36228028059 059087 088118 119148 149179 180209 210240 241271 272301 302332 333362 36329029????? 060088 089119 120149 150180 181210 211241 242272 273302 303333 334363 36430030?089 090120 121150 151181 182211 212242 243273 274303 304334 335364 36531031?090 091?151 152?212 213243 244?304 305?365 366 days days daysdays ................
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